radiology

Which arm compartment performs elbow flexion and forearm supination?

Anterior arm compartment

Which muscles are in the anterior arm compartment?

Biceps brachii (long & short heads), brachialis, coracobrachialis

Which arm compartment performs elbow extension?

Posterior arm compartment

Which muscle dominates the posterior arm compartment?

Triceps brachii

What is the primary function of the anterior (volar) forearm compartment?

Wrist flexion, finger flexion, forearm pronation

On MRI, which compartment would you click for finger flexion?

Anterior (volar) forearm compartment

Superficial muscles of the anterior forearm mainly do what?

Wrist flexion and pronation

Deep muscles of the anterior forearm mainly do what?

Finger flexion (FDP, FPL)

What is the primary function of the posterior (dorsal) forearm compartment?

Wrist extension, finger extension, supination

On MRI, which compartment would you click for finger extension?

Posterior (dorsal) forearm compartment

Which posterior forearm muscle is a supinator (deep)?

Supinator

Primary function of the anterior thigh compartment?

Knee extension (± hip flexion)

Main muscle group in the anterior thigh?

Quadriceps femoris

Primary function of the medial thigh compartment?

Hip adduction

On MRI, which compartment would you click for adducting the thigh?

Medial thigh compartment

Primary function of the posterior thigh compartment?

Hip extension and knee flexion

Which muscle group dominates the posterior thigh?

Hamstrings

Primary function of the anterior leg compartment?

Dorsiflexion of the foot and toe extension

MRI hotspot asks “Click the muscle that dorsiflexes the foot.” Where do you click?

Anterior leg compartment

Primary function of the lateral leg compartment?

Foot eversion

Primary function of the superficial posterior leg compartment

Plantarflexion

Which muscles dominate superficial posterior leg?

Gastrocnemius, soleus

Primary function of the deep posterior leg compartment?

Toe flexion and plantarflexion (support arch)

MRI hotspot asks“Click the muscle that flexes the toes.” Where do you click?

Deep posterior leg compartment

spondylolysis

spondylolysis

Spondilolisthesis

Spondylosis

Iliolumbar ligament at L5

Accessory rib arising from 7th cervical vertebra

Failure of separation of two or more adjacent vertebral bodies Klippel-Feil Syndrome

Hemivertebrae common cause of congenital scoliosis

Butterfly vertebrae - anterior spina bifida

Limbus vertebrae

Unfused secondary ossification center, usually anterosuperior corner • Nucleus pulposus herniates through vertebral body endplate beneath ring apophysi

Schmorl Nodes • Herniation of intervertebral disk into and through central portion of end plate