MMT Nerve Innervation and Muscle Function 3

Question 1

The thenar muscles tested during thumb opposition MMT are primarily innervated by which nerve?

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Axillary nerve

Question 2

Which nerve root is primarily responsible for shoulder external rotation, tested via the infraspinatus in MMT?

Accepted Answer

C5

Answer

C4

Answer

C6

Answer

C7

Question 3

The rhomboid muscles, tested by scapular retraction in MMT, are innervated by which nerve?

Accepted Answer

Dorsal scapular nerve

Answer

Long thoracic nerve

Answer

Suprascapular nerve

Answer

Thoracodorsal nerve

Question 4

In MMT, which muscle's grade most directly reflects C7 nerve root function?

Accepted Answer

Triceps brachii

Answer

Biceps brachii

Answer

Deltoid

Answer

Pronator teres

Question 5

Weakness of foot eversion during MMT implicates which nerve?

Accepted Answer

Superficial peroneal nerve

Answer

Deep peroneal nerve

Answer

Tibial nerve

Answer

Sural nerve

Question 6

Forearm pronation weakness during MMT most directly implicates which nerve?

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Musculocutaneous nerve

Question 7

The iliopsoas, primary muscle tested in hip flexion MMT, receives innervation from which source?

Accepted Answer

Direct lumbar plexus branches and femoral nerve (L1-L3)

Answer

Femoral nerve only (L2-L4)

Answer

Obturator nerve only (L2-L3)

Answer

Superior gluteal nerve (L4-S1)