This joint allows the head to nod up and down.
What is the atlanto-occipital joint?
While a sagittal plane divides the body into right and left parts, this plane divides the body into an anterior and posterior part.
What is a frontal (coronal) plane?
This vessel is found traversing the triangular space of the shoulder to supply the posterior region of the scapula with oxygenated blood.
What is the circumflex scapular artery?
During venipuncture of the median cubital vein, inserting the needle too deeply can result in an injury of this nerve that traverses the cubital fossa.
What is median nerve?
Identify the structure indicated by the red arrow.

What is the extensor pollicis longus muscle?
The latissimus dorsi muscle of the superficial group originates from the spinous processes of the vertebrae (T6-L5) and inserts onto this structure.
What is the floor of the intertubercular sulcus of the humerus?
These joints are composed of bones joined together by tissue, allowing little to no movement. Common examples of this type of joint are the sutures found in the cranium.
What is fibrous joint?
Of the four rotator cuff muscles, this muscle holds the responsibility of medial rotation of the humerus.
What is the subscapularis muscle?
This structure articulates with the bony feature indicated by the star.

What is the coronoid process of the ulna?
This structure branches to innervate the thenar muscles of the hand.
What is the recurrent branch of the median nerve?
The serratus posterior inferior muscle of the intermediate group performs this function.
What is the depression of ribs 9-12?
These anatomical structures carry efferent information directly into the spinal cord.
What are anterior rootlets?
The pectoralis minor muscle receives innervation from this nervous structure.
What is the medial pectoral nerve?
This structure is responsible for providing innervation to two and a half muscles in the deep flexor compartment of the forearm.
What is the anterior interosseous nerve?
The fifth digit receives more muscle control than any of the other digits in the hand. These contributing muscles make up the hypothenar group.
What are flexor digiti minimi, abductor digiti minimi, and opponens digiti minimi?
The suboccipital triangle is bordered by three of the four suboccipital muscles and is enclosed by the semispinalis capitis muscle. This nervous structure is found as one of the contents within the space.
What is the posterior ramus of C1 (Suboccipital nerve)?
The sympathetic division of the Autonomic nervous system (ANS) carries information to the prevertebral ganglia of visceral targets in the abdomen and pelvis by way of these nervous structures.
What are splanchnic nerves?
The upper limb is supplied with blood by several contributing arteries. The subscapular branch of the third part of the axillary artery gives rise to these branches.
What are the thoracodorsal and circumflex scapular arteries?
The carpal tunnel acts as a passageway for several structures from the flexor compartment of the forearm into the hand. These three muscles traverse this space.
What are flexor pollicus longus, flexor digitorum superficialis, and flexor digitorum profundus?
The hand features a network of vessels that work together to deliver oxygenated blood to the area. These structures branch from the deep palmar arch and connect with the common palmar digital arteries of the superficial arch.
What are the palmar metacarpal arteries?
A 43-year-old female patient presents with weakness in her lower extremity and persistent lower back pain that worsens with activity. Her MRI reveals that this anatomical structure, indicated by the arrow, has moved posteriorly to protrude into the vertebral canal.

What is the nucleus pulposus?
A 32-year-old female arrives at the Emergency Department in active labor. She immediately requests an epidural for the delivery. If time permits, the doctor will insert the needle into this space to deliver the medication.
What is the space between L3/L4 or L4/L5?
A 6-year-old male is brought to the Emergency Department by his mother. She expresses concern that her son is frequently experiencing progressive shortness of breath, loss of sensation in his lateral arm and forearm, and reduced arm flexion. You suspect an injury to these nerve roots.
What are C5/C6 spinal roots?
A 26-year-old male carpenter has been experiencing pain in his proximal forearm that worsens with activity. During his physical exam, wrist flexion is reduced but remains possible. You assume this to be the most likely diagnosis.
What is pronator teres syndrome?
A 16-year-old baseball player arrives at the emergency department after sustaining an injury to his right medial wrist. When asked to extend his fingers, the physician notices that his right hand is in a fixed claw position. You suspect this structure is damaged.
What is the ulnar nerve?