brachocephalic and msk

Question 1

wrist drop
decreased grip strength
loss of sensation over the posterior arm and forearm.

Answer 1

The radial nerve

commonly injured by a midshaft fracture of the humerus or compression of the axilla from crutches or arm over the chair. This presents as a wrist drop, decreased grip strength, and loss of sensation over the posterior arm and forearm.

Question 2

loss of wrist flexion
loss of flexion of medial fingers
loss of abduction and adduction of fingers
loss of sensation over the medial fingers (little finger and half of the ring finger)
loss of sensation over hypothenar eminence.

Answer 2

Ulnar nerve injury

occurs commonly from a fracture of the medial epicondyle of humerus. This presents as loss of wrist flexion, flexion of medial fingers, abduction and adduction of fingers, and loss of sensation over the medial fingers (little finger and half of the ring finger), and hypothenar eminence.

Question 3

loss of thenar muscle group activity- opposition, abduction and flexion of thumb

Answer 3

recurrent branch of the median nerve

occurs from superficial lacerations of the palm, which leads to loss of thenar muscle group activity (eg, opposition, abduction and flexion of thumb).

Question 4

flattened deltoid and loss of sensation over the deltoid muscle and lateral arm.

Answer 4

The axillary nerve

injured by a surgical neck of fracture and anterior dislocation of humerus. This leads to a flattened deltoid and loss of sensation over the deltoid muscle and lateral arm.

Question 5

loss of forearm flexion
loss of forearm supination
loss of sensation over the lateral forearm.

Answer 5

The musculocutaneous nerve

injured by upper trunk compression which leads to loss of forearm flexion and supination and loss of sensation over the lateral forearm.

Question 6

inability to make a fist
pain with pronation of the forearm
loss of wrist flexion
lateral finger flexion
thumb opposition.

Answer 6

median nerve injury

most commonly cause by supracondylar fracture

inability to make a fist (eg, ape hand deformity)
pain with pronation of the forearm
loss of wrist flexion
lateral finger flexion
thumb opposition.