What is Dr. Zubair Khalid's research focus?

Dr. Zubair Khalid specializes in molecular virology, mRNA vaccine development, and computational biology, with a focus on avian pathogens like IBDV and Avian Reovirus.

Where is Dr. Zubair Khalid currently working?

Dr. Zubair Khalid is a Postdoctoral Research Associate at the University of Maryland (UMD), specifically within the Department of Animal and Avian Sciences.

Coronal Cut: Definition and Anatomical Planes

Name: Coronal Cut: Definition and Anatomical Planes
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-09-20

A coronal cut is a slice through the body that separates it into dorsal (upper, toward the spine) and ventral (lower, toward the belly) parts. It runs perpendicular to both the sagittal plane, which divides the body into left and right, and the transverse plane, which divides it into cranial and caudal segments.

The coronal plane is also called the frontal plane. In veterinary anatomy the term coronal is used alongside frontal, and both describe the same orientation. The name comes from the Latin corona, or crown, because the plane runs parallel to the coronal suture of the skull, the seam that crosses the top of the head like a crown.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

What Is a Coronal Cut?

Diagram of the coronal plane of the human body — The coronal plane divides the body into front and back portions, illustrating the coronal cut described in the article. Image: Osteomyoamare This diagram was created with Microsoft Word ., CC BY 3.0, via Wikimedia Commons.

A coronal cut is any planar section that passes through the body from side to side while staying parallel to the long axis of the trunk. Imagine a dog standing in a normal posture. A coronal cut would slice the dog horizontally if you were looking at it from the side, separating the back half from the belly half. The cut does not have to be exactly horizontal in space. What defines it is its relationship to the body's own axes, not to gravity.

The coronal plane is one of three standard anatomical planes used to describe position and to plan imaging. The other two are the sagittal plane and the transverse plane. Together these three planes form a coordinate system that lets clinicians, surgeons, and radiologists describe exactly where a structure sits and how a cut should be made.

In human anatomy the same three planes exist, but the vocabulary changes. Human anatomy uses superior and inferior for up and down, anterior and posterior for front and back, and left and right. Veterinary anatomy replaces superior with cranial (toward the head) and inferior with caudal (toward the tail) for structures on the trunk and limbs. Dorsal and ventral replace posterior and anterior for the trunk. This shift matters because a quadruped's body axis is rotated 90 degrees relative to a human's.

The Three Cardinal Anatomical Planes

Sagittal Plane

The sagittal plane divides the body into left and right parts. A cut exactly through the midline is called the median or midsagittal plane. Any sagittal plane off the midline is called a parasagittal plane. Sagittal cuts are useful for viewing structures that run head to tail, such as the spine, the nasal cavity, and the long axis of a limb.

In veterinary imaging, sagittal reconstructions are routinely used to assess spinal alignment and to evaluate the nasal cavity. A study of maxillary nerve block approaches in dogs used sagittal and dorsal plane measurements from cone-beam computed tomography to map how far contrast medium spread along the nerve [1]. The sagittal plane showed the lengthwise spread of injectate, which is exactly what a clinician needs to know when planning a nerve block.

Transverse Plane

The transverse plane, also called the horizontal or axial plane, divides the body into cranial and caudal parts. In a standing dog, a transverse cut is like slicing a loaf of bread crosswise. Transverse images are the default in most computed tomography and magnetic resonance imaging protocols because they show the cross-sectional relationship of organs, vessels, and bones at a single level.

A study of Hodgkin lymphoma in people used both coronal and transverse measurements on computed tomography to define bulky disease, and found that some patients who did not meet the transverse threshold did meet the coronal threshold [2]. That finding illustrates a practical point that applies across species: a lesion can look small in one plane and large in another, so measuring in more than one plane gives a fuller picture.

Coronal Plane

The coronal plane divides the body into dorsal and ventral parts. In a dog or horse, a coronal cut runs from left to right and from head to tail, staying parallel to the back. It is the plane you would see if you looked at the animal from directly above or directly below after removing the near surface.

Coronal reconstructions are valuable for structures that have a left-right symmetry or that span the width of the body. The nasal septum, the hip joint, the stifle, and the vertebral column are all commonly assessed in the coronal plane. A study of nasal septal anatomy in patients with cleft lip and palate measured septal deviation in three coronal sections, at the anterior nasal spine, the posterior nasal spine, and the midpoint between them [3]. The coronal plane was chosen because the septum is a midline structure and its deviation is best seen when the slice runs across it from side to side.

Why the Coronal Plane Matters in Veterinary Anatomy

Veterinary anatomy uses a directional vocabulary that differs from human anatomy. The table below summarizes the key terms and how they map across species.

Feature	Human	Dog	Horse
Coronal plane divides	Anterior and posterior	Dorsal and ventral	Dorsal and ventral
Sagittal plane divides	Left and right	Left and right	Left and right
Transverse plane divides	Superior and inferior	Cranial and caudal	Cranial and caudal
Up direction	Superior	Dorsal	Dorsal
Down direction	Inferior	Ventral	Ventral
Toward head	Superior (for trunk)	Cranial	Cranial
Toward tail	Inferior (for trunk)	Caudal	Caudal
Front of limb	Anterior	Cranial	Cranial
Back of limb	Posterior	Caudal	Caudal
Alternative name for coronal	Frontal	Frontal	Frontal

The horse and dog share the same veterinary conventions. The human row differs because the human body axis is vertical, so the coronal plane separates front from back rather than top from bottom. This is the single most common source of confusion for students moving between human and veterinary anatomy.

A coronal cut in a horse is often used to assess the hoof and the distal limb. Because the horse's digit is a single weight-bearing column, coronal sections through the foot show the relationship of the distal phalanx, the navicular bone, and the deep digital flexor tendon in a way that sagittal sections do not. In the dog, coronal sections of the hip are used to evaluate femoral head coverage and capsular thickness. A matched cohort study of dysplastic hips in people measured iliofemoral ligament thickness on coronal magnetic resonance sequences and found decreased capsular thickness in dysplastic hips compared with controls [4]. The same principle applies in dogs: coronal sequences show the dorsal and ventral extent of the hip capsule and the relationship of the femoral head to the acetabulum.

How the Coronal Plane Relates to Radiography and CT

Standard radiographic views are projections, not slices. A radiograph collapses a three-dimensional body onto a two-dimensional image. The names of the views describe the direction the x-ray beam travels, not the plane of the cut.

A ventrodorsal radiograph of the thorax is taken with the beam passing from ventral to dorsal. The resulting image is essentially a coronal projection: it shows the dorsal and ventral structures superimposed. A dorsoventral radiograph is the reverse. A lateral radiograph is a sagittal projection. A craniocaudal radiograph of a limb is a transverse projection.

Computed tomography and magnetic resonance imaging produce true planar slices. The scanner reconstructs images in sagittal, transverse, and coronal planes from the same data set. This is why a single CT scan can be reformatted into any of the three planes without rescanning the patient. A study of metacarpal anatomy used raw CT data to reconstruct sections in the plane of each bone and then converted them to sagittal and coronal weighted projections, which the authors described as equivalent to perfect orthogonal radiographs [5]. That study showed that plain radiographic measurements had underestimated the capital-axis angle and overestimated the dorsal bend of the metacarpals, because the lateral projection does not capture the true coronal geometry.

In practice, the coronal plane is the workhorse for certain questions. It shows the left-right symmetry of paired structures, the width of the spinal canal, the height of vertebral bodies, and the alignment of joints in the frontal plane. A study of total ankle replacement used coronal plane alignment as a matching criterion and found that patient-specific instrumentation systems differed in their accuracy of postoperative coronal alignment [6]. The coronal plane was the relevant plane because ankle alignment is judged by how the tibia sits over the talus from front to back, which is a coronal relationship.

The Coronal Plane in Cross-Sectional Anatomy

Cross-sectional anatomy atlases use the three planes to build a mental model of the body. A study of the goat urinary tract compared anatomical frozen sections with CT images using median, sagittal, and cross-anatomical sections [7]. The cross-anatomical sections are transverse or coronal depending on the level, and they let the reader match a two-dimensional image to a three-dimensional structure.

The coronal plane is particularly useful for organs that are flattened in the dorsal-ventral direction. The kidney is a good example. In the goat, both kidneys are readily distinguishable in anatomical and CT scans, and the coronal plane shows the relationship of the cortex, medulla, and hilus across the width of the organ [7]. In the dog, coronal reconstructions of the kidney show the renal pelvis and the diverticula that branch into the medulla.

The coronal plane also shows the branching pattern of vessels and ducts. The maxillary nerve in the dog runs from the trigeminal ganglion to the infraorbital canal, and a study of nerve block approaches used dorsal and sagittal plane measurements to map the spread of contrast medium [1]. A coronal reconstruction would add the left-right dimension, showing how the nerve relates to the zygomatic arch and the orbit.

Common Myths and Misunderstandings

The most common myth is that the coronal plane is always horizontal in space. This is true for a standing human but not for a standing quadruped. In a dog, the coronal plane is horizontal when the dog is standing, but it becomes vertical if the dog is lying on its side. The plane is defined by the body's axes, not by gravity.

A second myth is that coronal and frontal are different planes. They are the same plane. Frontal is the older term and is still used in human anatomy and in some veterinary texts. Coronal is more common in radiology and in cross-sectional imaging.

A third myth is that a coronal cut is the same as a dorsal cut. A dorsal cut is a section taken from the dorsal surface, and it may be coronal or transverse depending on the angle. The term dorsal plane is sometimes used interchangeably with coronal plane in veterinary imaging, but strictly speaking dorsal describes the surface of entry, not the orientation of the slice.

A fourth myth is that the coronal plane is only useful for the head. The coronal plane is used throughout the body. It is the standard plane for assessing hip alignment, knee alignment, ankle alignment, and vertebral body height. A study of thoracolumbar burst fractures used sagittal alignment and vertebral body heights as imaging outcomes, and coronal reconstructions are part of the standard assessment of vertebral body integrity [8].

Practical Implications for Owners and Keepers

If your veterinarian recommends a CT or MRI scan, the report may mention coronal, sagittal, or transverse reconstructions. These are not different scans. They are different ways of displaying the same data. The coronal reconstruction shows the body from front to back, the sagittal shows it from side to side, and the transverse shows it as a cross-section.

For a dog with a suspected spinal problem, the coronal plane shows the width of the spinal canal and the symmetry of the vertebral bodies. For a horse with a suspected hoof problem, the coronal plane shows the balance of the distal phalanx within the hoof capsule. For a dog with a suspected hip problem, the coronal plane shows the coverage of the femoral head by the acetabulum.

The plane chosen for a particular study depends on the question being asked. A radiologist will reformat the data into the plane that best shows the suspected lesion. If you are looking at a report and see a measurement given in the coronal plane, it means the measurement was taken from a slice that runs from left to right across the body.

Clinical Relevance, Limitations and Common Mistakes

The coronal plane is clinically relevant because it is the plane of symmetry. Any structure that should be symmetrical left and right is best assessed in the coronal plane. Deviations from symmetry, such as a shifted nasal septum, a tilted vertebral body, or an uneven joint space, are most obvious in a coronal reconstruction.

The main limitation is that the coronal plane does not show the cranial-caudal extent of a lesion. A mass that is 2 cm wide in the coronal plane may be 10 cm long in the sagittal plane. This is why the Hodgkin lymphoma study measured bulky disease in both coronal and transverse planes and found that some patients were bulky in one plane but not the other [2]. The same principle applies to any species: a single plane can underestimate the size of a lesion.

A common mistake is to confuse the coronal plane with the transverse plane when reading a CT report. The coronal plane divides dorsal from ventral. The transverse plane divides cranial from caudal. If a report says a lesion is 3 cm in the coronal plane and 5 cm in the transverse plane, the 3 cm measurement is the width from left to right, and the 5 cm measurement is the length from head to tail.

A second common mistake is to apply human directional terms to a quadruped. Saying that a dog's heart is superior to its diaphragm is incorrect. The correct term is cranial. Saying that a horse's hoof is inferior to its fetlock is incorrect. The correct term is distal or ventral, depending on the context.

A third common mistake is to assume that a coronal cut is always the best view. For a structure that runs head to tail, such as the spinal cord, the sagittal plane is usually better. For a structure that runs left to right, such as the corpus callosum, the coronal plane is usually better. The choice depends on the anatomy.

Individual cases need a veterinarian. The planes described here are a framework for understanding anatomy and imaging, not a substitute for professional assessment.

Frequently Asked Questions

What is a coronal cut?

A coronal cut is a slice through the body that separates it into dorsal and ventral parts. It runs parallel to the long axis of the trunk and perpendicular to the sagittal and transverse planes.

Is the coronal plane the same as the frontal plane?

Yes. Coronal and frontal are two names for the same plane. Frontal is more common in human anatomy, and coronal is more common in radiology and veterinary imaging.

How does a coronal cut differ from a sagittal cut?

A coronal cut divides the body into dorsal and ventral parts. A sagittal cut divides the body into left and right parts. The two planes are perpendicular to each other.

How does a coronal cut differ from a transverse cut?

A coronal cut divides the body into dorsal and ventral parts. A transverse cut divides the body into cranial and caudal parts. The two planes are perpendicular to each other.

Why do veterinarians use dorsal and ventral instead of superior and inferior?

Veterinarians use dorsal and ventral because quadrupeds have a horizontal body axis. Superior and inferior describe a vertical axis and do not map cleanly onto a dog or horse.

What does a coronal reconstruction show on a CT scan?

A coronal reconstruction shows the body from front to back, or from dorsal to ventral in a quadruped. It is useful for assessing symmetry, joint alignment, and the width of structures that span the body from left to right.

Can a coronal cut be used to measure a tumor?

Yes. A coronal cut can be used to measure the width of a tumor from left to right. A study of lymphoma found that some tumors were bulky in the coronal plane but not in the transverse plane, so measuring in more than one plane gives a more complete picture [2].

Is the coronal plane used in veterinary dentistry?

Yes. The coronal plane is used to assess the symmetry of the skull, the position of the nasal septum, and the alignment of the dental arches. A study of nasal septal anatomy used coronal sections to measure septal deviation in patients with cleft lip and palate [3].