01 / 23

Anatomy Lab
Landmarks & Terminology

Master the directional terms, body planes, and surface landmarks that form the universal language of anatomy lab identification.

Anatomy & Physiology

Why Anatomical Language Matters

In medicine, law enforcement, and biology, describing the location of a structure as "near the shoulder" is dangerously vague. Anatomical terminology provides a precise, universal coordinate system so that every professional describes the exact same location regardless of body position or orientation.

The Anatomical Position

Eyes forward
Palms
forward
Palms
forward
Standing erect
Feet flat, together

The Three Body Planes

Sagittal
Left / Right
Frontal
Anterior / Posterior
Transverse
Superior / Inferior
Sagittal
Divides body into left and right halves. A midsagittal plane splits it equally.
Frontal
Divides body into anterior (front) and posterior (back) portions.
Transverse
Divides body into superior (upper) and inferior (lower) portions.

Core Directional Terms

Superior
Inferior
Medial
Lateral
Proximal
Distal
Anterior
(ventral / front)
Posterior
(dorsal / back)

Directional Pairs Defined

Superior / Inferior
Toward the head (above) vs. toward the feet (below). The heart is superior to the stomach.
Anterior / Posterior
Toward the front vs. toward the back. The sternum is anterior to the spine.
Medial / Lateral
Toward the midline vs. away from the midline. The nose is medial to the ears.
Proximal / Distal
Closer to the trunk (limb origin) vs. farther from the trunk. The elbow is proximal to the wrist.

Superficial vs. Deep

Skin (most superficial)
Subcutaneous tissue
Muscle
Bone (deepest)
Superficial
Deep

Ventral/Dorsal vs. Anterior/Posterior

In humans (bipedal), anterior = ventral and posterior = dorsal. But in quadruped animals, these terms diverge because the belly faces down, not forward.

Term In Humans In Quadrupeds
Anterior = Ventral (front) = toward the head
Posterior = Dorsal (back) = toward the tail
Ventral = front surface = belly (underside)
Dorsal = back surface = spine (top side)

Major Body Regions

Axial
Head, neck, and trunk: the central axis of the body. Includes cephalic, cervical, thoracic, abdominal, and pelvic regions.
Appendicular
Upper and lower limbs (extremities): everything that attaches to the axial skeleton. Includes brachial, antebrachial, femoral, and crural regions.
Axial (blue box)
Appendicular
(green lines)
Axial Regions:
Cephalic (head)
Cervical (neck)
Thoracic (chest)
Abdominal (belly)
Pelvic (pelvis)
Appendicular Regions:
Brachial (arm)
Antebrachial (forearm)
Femoral (thigh)
Crural (leg)

Surface Landmarks: Anterior View

Orbital (eye)
Sternal (breastbone)
Umbilical (navel)
Antecubital
(front of elbow)
Inguinal (groin)
Patellar (kneecap)

Surface Landmarks: Posterior View

Occipital
(back of head)
Scapular
(shoulder blade)
Vertebral (spine)
Olecranal
(back of elbow)
Gluteal (buttock)
Popliteal
(back of knee)
Calcaneal (heel)

How to Identify in Lab

1
Confirm anatomical position. Mentally place the specimen upright, palms forward, before describing anything.
2
Identify the body plane. Determine which plane the section was cut along: sagittal, frontal, or transverse.
3
Use directional pairs. Describe the structure's location relative to a known landmark using at least two directional terms (e.g., "superior and lateral").
4
Name the body region. State whether the structure is in an axial or appendicular region, then specify the sub-region (e.g., "thoracic" or "brachial").
5
Note depth. Indicate whether the structure is superficial or deep relative to surrounding tissues.

Example 1: Locating the Heart

midline
Heart
Description:
Axial region (thoracic)
Superior to the diaphragm
Mostly left of midline
Posterior to the sternum
Deep to the rib cage
Diaphragm
Sternum

Example 2: Describing a Wound

A patient has a laceration on the front of the right forearm, between the elbow and wrist, closer to the elbow. How would you describe this using anatomical terminology?

1
Region: Appendicular: antebrachial region (forearm)
2
Surface: Anterior (ventral) surface of the forearm
3
Proximity: Proximal antebrachial region (closer to the elbow, nearer trunk attachment)
4
Side: Right upper extremity (patient's right)
5
Depth: Superficial laceration (skin level)

Example 3: Cross-Section ID

You are shown a cross-sectional image through the abdomen. How do you orient yourself and identify structures?

Anterior (front)
Posterior (back)
Patient's
Right
Patient's
Left
Spine
Liver
Stomach
Aorta

Common Mistakes

✕ Forgetting Anatomical Position
Describing left/right based on how a diagram faces you rather than the patient's own left and right in anatomical position.
✕ Mixing Up Proximal/Distal
Saying the wrist is "proximal" to the elbow. Remember: proximal = closer to the trunk, distal = farther away.
✕ Confusing Planes
Calling a frontal section "transverse." Frontal divides front/back; transverse divides top/bottom. Sagittal divides left/right.

Terminology Quick Reference

Term Meaning Opposite Example
Superior Above / toward head Inferior Head is superior to chest
Anterior Front / ventral Posterior Sternum is anterior to spine
Medial Toward midline Lateral Nose is medial to ears
Proximal Closer to trunk Distal Elbow is proximal to wrist
Superficial Closer to surface Deep Skin is superficial to muscle

Region Names to Memorize

Common Name Anatomical Term Location
Head Cephalic Axial
Neck Cervical Axial
Chest Thoracic Axial
Armpit Axillary Junction of trunk and arm
Upper arm Brachial Appendicular
Front of elbow Antecubital Appendicular
Back of knee Popliteal Appendicular
Calf / shin Crural Appendicular

Question 1 of 5

A patient has a bruise on the anterior surface of the right antebrachial region. Where is this bruise located?

Question 2 of 5

Which body plane divides the body into superior and inferior portions?

Question 3 of 5

The elbow is ________ to the wrist and ________ to the shoulder.

Question 4 of 5

In anatomical position, which of the following statements is correct?

Question 5 of 5

The popliteal region is the anatomical term for which body area?