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Anatomy > Brachial Plexus > Flashcards

Brachial Plexus Flashcards

1
Q

What muscles does the axillary nerve innervate?

A

Teres minor and deltoid muscle

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2
Q

What muscle does the musculocutaneous nerve innervate?

A

Muscles of the anterior portion of the arm (brachialis, coracobrachialis, and biceps brachii)

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3
Q

What muscles does the median nerve innervate?

A

Muscles of the anterior compartment of the forearm flexors ; except: medial half of flexor digitorum profundus and flexor carpi ulnaris

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4
Q

What muscles does the ulnar nerve innervate?

A

Medial half of flexor digitorum profundus and flexor carpi ulnaris

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5
Q

What muscles does the radial nerve innervate?

A

All muscles in the posterior compartment of forearm extensors AND triceps brachii

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6
Q

What are the 3 trunks?

A
  1. Superior trunk (arises from C5 + C6)
  2. Middle trunk (arises from C7)
  3. Inferior trunk (arises from C8 + T1)
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7
Q

What are the 3 cords?

A

Lateral cord, medial cord, and posterior cord

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8
Q

What trunks and divisions form the lateral cord?

A

Anterior division of superior trunk and anterior division of middle trunk (C5 - C7)

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9
Q

What trunks and divisions form the posterior cord?

A

All posterior divisions of each trunk (C5-T1)

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10
Q

What trunks and divisions form the medial cord?

A

Anterior division of the inferior trunk

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11
Q

What non-terminal nerves branch from superior trunk?

A

Long thoracic n., Dorsal scapular n., suprascapular n., nerve to subclavius, and lateral pectoral nerve (only nerve after divisions/in cord portion).

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12
Q

What non-terminal nerves branch from middle trunk?

A

Upper subscapular, thoracodorsal, lower subscapular

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13
Q

What non-terminal nerves branch from inferior trunk?

A

Medial pectoral nerve, medial brachial cutaneous n., and medial ante-brachial cutaneous n.

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14
Q

What terminal nerves branch from lateral cord?

A

Musculocutaneous and contributes to median nerve

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15
Q

What terminal nerves branch from posterior cord?

A

Radial Nerve + Axillary Nerve

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16
Q

What terminal nerves branch from medial cord?

A

Ulnar nerve and contributes to median nerve

17
Q

What does the long thoracic nerve run parallel with?

A

Lateral Thoracic Artery

18
Q

What causes winged scapula?

A

Paralysis of serratus anterior and damage to long thoracic nerve (C5-C7)

*seen after radical masectomy

19
Q

What causes Erb-Duchenne Palsy?

A

Lesion in superior trunk (C5+C6) of brachial plexus

20
Q

What causes Klumpke Palsy (claw hand)?

A

-Lower brachial plexus injury (C8+T1)
….C8 and T1 forms inferior trunk… which forms medial cord… contributes to median nerve + ulnar nerve (SO MEDIAN + ULNAR NERVES are affected).

-Horner’s syndrome may be associated

Anatomy (8 decks)

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