MSK Ultrasound

Question 1

Smallest subunit of muscle tissue that can be discerned with ultrasound and appears hypoechoic:

Answer 1

Fascicle: bundle of myofibers (cells)

Question 2

Identify the labeled structures in this longitudinal view of the anterior elbow:

Answer 2

Brachialis
Biceps brachii tendon with anisotropy (anterior view)**
Radial tuberosity
**The distal biceps brachii tendon is difficult to image anteriorly because its oblique course results in anisotropy. Often the lateral or medial windows provide better visualization of the tendon.

Question 3

Infraspinatus

• Origin:
• Insertion:
• Action:

Answer 3

• Origin: Infraspinous fossa
• Insertion: Greater tuberosity- middle facet (overlaps supraspinatus)
• Action: External rotation of shoulder

Question 4

Draw and label the flexor tendons, bones, and joints of the finger:

Answer 4

Question 5

Name the adductor muscles from superficial to deep when image at origins on pubic bone:

Answer 5

Adductor longus
Adductor brevis
Adductor magnus
Memory aid—aLaBaMa