Innervation

thoracodorsal nerve

Name the innervation: Latissimus dorsi

superficial peroneal nerve

Name the innervation: Peroneus longus

long thoracic nerve

Name the innervation: Serratus anterior

deep peroneal nerve

Name the innervation: Tibialis anterior

1. roots 2. trunks 3. divisions 4. cords 5. nerves

Sequence the following brachial plexus structural terms based on their location in the body from proximal to distal: trunks divisions nerves roots cords

subscapularis

T/F: The _________ is innervated by the upper subscapular + lower subscapular nerves.

True

T/F: The biceps brachii is innervated by the musculocutaneous nerve.

True

T/F: The biceps femoris is innervated by the sciatic nerve.

False - tibial nerve

T/F: The gastroc is innervated by the femoral nerve.

False - superior gluteal nerve

T/F: The lumbar plexus innervates the gluteus medius.

ulnar

T/F: The medial half of the flexor digitorum profundus is innervated by the ulnar nerve.

True

T/F: The obturator nerve innervates the adductor magnus.

True

T/F: The sacral plexus innervates the piriformis.

True

T/F: The superior gluteal nerve innervates the TFL.

suprascapular

T/F: The supraspinatus is innervated by the __________ nerve.

False - radial nerve

T/F: The triceps are innervated by the musculocutaneous nerve.

median

Wasting of the thenar eminence musculature indicates possible damage to which nerve? radial ulnar median axillary musculocutaneosu

Correct Answer: axillary artery The brachial plexus includes three cords (i.e., lateral, medial, posterior) that are named according to their position with respect to the axillary artery.

What artery is used as a point of reference when naming the cords of the brachial plexus? axillary artery carotid artery subclavian artery vertebral

Correct Answer: ventral nerve root of C7 Efferent fibers that control motor function are located in the ventral nerve root as they exit the spinal cord. The triceps receive their primary innervation from the C7 spinal segment.

An inability to extend the elbow could result from pathology affecting the: dorsal nerve root of C7 ventral nerve root of C7 dorsal nerve root of C8 ventral nerve root of C6

Correct Answer: C8-T1 The majority of the intrinsic muscles of the thumb and fingers are innervated at the C8-T1 spinal segments.

An inability to splay the fingers would indicate damage at which spinal segments? C5-C6 C6-C7 C7-C8 C8-T1

Correct Answer: passing through the two heads of the pronator teres Pronator syndrome occurs when the median nerve is compressed as it passes through the two heads of the pronator teres. This will affect sensory and motor function of the median nerve.

At which of the following sites might the median nerve be compressed? passing through the two heads of the pronator teres passing beneath the pisohamate ligament passing between the two heads of the supinator passing through the canal of Frohse

Correct Answer: axillary nerve The axillary nerve arises from the C5-C6 nerve roots and innervates the deltoid muscle. Damage to the axillary nerve commonly occurs following a fracture to the head of the humerus.

Deltoid atrophy may be associated with an injury to the: axillary nerve median nerve radial nerve subclavian nerve

Correct Answer: musculocutaneous nerve The musculocutaneous nerve arises from the lateral cord of the brachial plexus. The nerve innervates the coracobrachialis, biceps brachii, and brachialis.

Injury to the posterior cord of the brachial plexus could involve all of the following except: thoracodorsal nerve radial nerve axillary nerve musculocutaneous nerve

radial nerve

Innervation of anconeous

inferior gluteal nerve

Innervation of glut max

tibial nerve

Innervation of popliteus

femoral nerve

Innervation of sartorius

Correct Answer: long thoracic nerve The serratus anterior maintains the scapula against the rib cage. Weakness in this muscle results in a characteristic winging of the scapula. The serratus anterior is innervated by the long thoracic nerve.

Paralysis of which nerve gives rise to scapular winging? suprascapular nerve long thoracic nerve subscapular nerve thoracodorsal nerve

Correct Answer: suprascapular The supraspinatus and infraspinatus are innervated by the suprascapular nerve. The muscles are two of the four muscles that make up the rotator cuff in addition to the subscapularis and teres minor.

The supraspinatus and infraspinatus muscles are both innervated by which nerve? axillary suprascapular lower subscapular upper subscapular

Correct Answer: sciatic nerve The sciatic nerve runs along the posterior thigh before it splits into the tibial nerve and common peroneal nerve at the level of the knee. The sciatic nerve supplies the hamstrings muscle group. The hamstrings muscle group consists of the semitendinosus, semimembranosus, and biceps femoris.

What nerve innervates the semitendinosus? obturator nerve posterior femoral nerve sciatic nerve common peroneal nerve

Correct Answer: spinal accessory nerve Cranial nerve XI (i.e., spinal accessory nerve) innervates the trapezius muscle. The trapezius includes three distinct portions that extend from the occiput to the thoracic vertebrae.

What nerve innervates the upper/middle/lower trap? suprascapular nerve radial nerve spinal accessory nerve dorsal scapular nerve

Correct Answer: superficial peroneal nerve The superficial peroneal nerve originates from the common peroneal nerve below the knee. The nerve innervates the peroneus longus and brevis muscles.

What nerve is identified in the image? deep peroneal nerve tibial nerve sciatic nerve superficial peroneal nerve

dorsal scap nerve long thoracic

Which 2 nerves originate from the rami of the brachial plexus? nerve to subclavius dorsal scap nerve long thoracic suprascapular thoracodorsal

tibial n medial plantar n

Which 2 of the following nerves innervate the great toe flexors? tibial nerve superficial peroneal deep peroneal medial plantar n lateral plantar n

ulnar radial

Which 2 of the following nerves innervate the musculature that allows ulnar deviation at the wrist? ulnar musculocutaneous radial axillary median

Correct Answer: quadriceps femoris The quadriceps femoris muscle is located on the anterior portion of the upper leg and serves as the primary extensor of the knee.

Which muscle is innervated by the femoral nerve? adductor longus iliopsoas quadriceps femoris hamstrings

Correct Answer: flexor digitorum profundus The ulnar nerve arises from the medial cord of the plexus and innervates the flexor carpi ulnaris, flexor digitorum profundus, and most of the small muscles of the hand.

Which muscle is innervated by the ulnar nerve? anconeus extensor carpi radialis flexor digitorum profundus supinator

Correct Answer: flexor digiti minimi The flexor digiti minimi is innervated by the lateral plantar nerve.

Which muscle of the lower extremity is not innervated by the tibial nerve? flexor hallucis longus flexor digitorum longus flexor digiti minimi tibialis posterior

Correct Answer: genitofemoral nerve The genital branch of the genitofemoral nerve arises from the roots of L1 and L2 and innervates the cremaster muscle. The cremaster muscle receives blood supply from the cremasteric artery.

Which nerve innervates the cremasteric muscle? ilioinguinal nerve obturator nerve genitofemoral nerve femoral nerve

axillary nerve

Which nerve innervates the deltoid muscle?

Correct Answer: phrenic nerve The diaphragm is the primary muscle of inspiration. It is a dome-shaped muscle that separates the thoracic cavity from the abdominal cavity. The muscle is innervated by the phrenic nerve.

Which nerve innervates the diaphragm? phrenic nerve ventral rami of lumbar nerves L2-L4 cranial nerve V cranial nerve XI

femoral nerve

Which nerve innervates the knee extensor musculature? sciatic nerve femoral nerve tibial nerve obturator nerve superficial peroneal

Correct Answer: thoracodorsal nerve The latissimus dorsi is innervated by the thoracodorsal nerve (C6, C7, C8) which extends from all three trunks of the brachial plexus, via the posterior cord.

Which nerve innervates the latissimus dorsi? thoracodorsal nerve dorsal scapular nerve spinal accessory nerve radial nerve

Correct Answer: adductor longus All of the options are innervated by the obturator nerve (L2-L4), but only the adductor longus is innervated by the anterior division. The pectineus is innervated by the obturator nerve in slightly less than 10% of individuals, while most often it is innervated by the femoral nerve.

Which of the following muscles is innervated by the anterior division of the obturator nerve? pectineus adductor magnus adductor longus gracilis

Correct Answer: suprascapular The suprascapular nerve (C4, C5, C6) extends from the superior trunk of the brachial plexus. The nerve innervates the supraspinatus and infraspinatus muscles.

Which of the following nerves does not have a connection from all three trunks of the brachial plexus? lower subscapular radial suprascapular thoracodorsal

obturator n

Which of the following nerves innervates the hip abductor musculature? sciatic n femoral n tibial n obturator n inferior gluteal n

Correct Answer: C5-T1 The brachial plexus is made up of spinal nerve roots C5 through T1.

Which spinal nerve roots contribute to the brachial plexus? C1-T1 C3-C8 C5-C8 C5-T1