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ANAT100 > LP #95 The Brachial Plexus > Flashcards

LP #95 The Brachial Plexus Flashcards

1
Q

A network of nerves

A

Plexus

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2
Q

4 somatic plexus

A
  • Cervical (C1-C4): neck, scalp & shoulder
  • Brachial (C5-T1): upper limb
  • Lumbar (L1-L4): lower limb
  • Sacral (L4-S4): gluteal region & lower limb
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3
Q

2 nerve roots

A
  • Dorsal (sensory) nerve root

* Ventral (motor) nerve root

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4
Q
  • composed of dorsal & ventral roots
  • mixed nerves contain sensory & motor nerve fibers
  • very short then branch
A

Spinal nerves

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5
Q

Branches of mixed spinal nerves are dorsal & ventral rami (which are mixed)
*mixed nerves contain sensory & motor nerve fibres

A

Rami

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6
Q

Only _______ rami contribute to somatic plexuses

A

Ventral

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7
Q

Rami communicants:

A

Part of ANS

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8
Q
  • Large network of nerves
  • From ventral rami C5-T1
  • located in neck & axilla:
  • ends in axilla where its cords travel along axillary artery & give rise to primary nerves of upper limb
A

The Brachial Plexus

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9
Q

The brachial plexus Innervations

A
  • upper limb
  • pectoral girdle
  • extrinsic back mms
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10
Q

Brachial plexus organization:

* Real Tired? Drink Coffee

A
  • Ventral rami
  • Trunk
  • Division
  • Cords
  • (branches: peripheral nn)
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11
Q

Produce network of nerves

  • arise from nerve roots via spinal nerves
  • originate from C5-T1 spinal nerves
A

Ventral rami

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12
Q

Trunks: 5 ventral rami converge into 3 trunks?

A
  • upper (C5,C6)
  • middle (C7)
  • lower (C8, T1)
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13
Q

Trunks diverge to form anterior & posterior divisions?

A

Divisions

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14
Q
  • posterior divisions converge to form posterior cord
  • anterior divisions of upper & middle trunks converge to form lateral cod
  • anterior division of lower trunk forms medial cord
A

Cords

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15
Q

Fascial compartments of upper limb

Arm?

A
  • ant compartment:
  • elbow/shoulder flexors
  • post. Compartment:
  • elbow/shoulder extensors
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16
Q

Fasical compart. Of upper limb

*Forearm?

A
  • Ant. Compart.:
  • wrist/ finger flexors
  • Post. Compart.:
  • wrist/ finger extensors
17
Q

4 major nerves Innervate upper limb mm?

A
  • Musculocutaneous
  • Radial
  • Median
  • Ulnar
18
Q
  • anterior brachial mm?
  • posterior brachial & antebrachial mm?
  • all lateral antebrachial mm; some lateral hands mm
  • flexor carpi ulnaris; most hand mm
A
  • musculocutaneous nerve
  • radial nerve
  • medial nerve
  • ulnar nerve
19
Q
  • originates from Posterior Cord
  • spinal segments: C5-C6
  • innervates:
  • motor: deltoid & teres minor
  • sensory: skin & joint capsule of shoulder
A

Axillary

20
Q
  • originates from lateral cord
  • spinal segment: C5-C7
  • innervates ant. Brachium:
  • motor: Biceps brachii, brachialis & coracobrachialis
  • sensory: skin on lateral forearm (very variable)
A

Musculocutaneous

21
Q
  • originates from lateral & medial cords
  • spinal segment: C5-C8, T1
  • innervate:
  • motor: most wrist flexor mm; 4 intrinsic hand mm
  • sensory: skin on lateral hand (palm) & dorsum of fingers 2-3
A

Median

22
Q
  • originates from medial cord
  • spinal segment: C8, T1
  • innervates:
  • motor: few wrist/finger flexor mm & most intrinsic hand mm
  • sensory: skin on ant. & post. Hand, medial third
A

Ulnar

23
Q
  • originates from posterior cord
  • largest n of brachial plexus
  • spinal segment: C5-C8, T1
  • innervates:
  • motor: posterior mm of the arm & forearm; supinator
  • sensory: skin on posterolateral surface of upper limb except dorsum of fingers 2-3
A

Radial

24
Q

Brachial plexus: minor peripheral nerves (Motor nerves)

A
  • Dorsal scapular
  • Long thoracic
  • Thoracodorsal
  • Nerve to subclavius
  • Suprascapular nerve
  • Medial pectoral
  • Lateral pectoral
  • Upper subscapular
  • Lower subscapular
25
Q

Brachial plexus: minor peripheral nerves (Cutaneous nerves)

A
  • Medial brachial cutaneous
  • Medial antebrachial cutaneous
  • Superior brachial cutaneous
  • Inferior brachial cutaneous
  • posterior brachial cutaneous
26
Q
  • originates from ventral ramus of C5

* innervates rhomboids & levator scapula

A

Dorsal scapular

27
Q
  • originates from ventral rami C5-C7

* innervates serratus anterior

A

Long thoracic

28
Q
  • originates from ventral rami C6-C8

* innervates latissimus dorsi

A

Thoracodorsal

29
Q
  • originates from ventral rami C4-C6

* innervates suclavius

A

Nerve to subclavius

30
Q
  • originates from ventral rami C4-C6

* innervates supraspinatus, infraspinatus & the shoulder joint

A

Suprascapular nerve

31
Q
  • originates from ventral rami C8-T1

* innervates pectoralis minor, pectoralis major

A

Medial pectoral

32
Q
  • originates from ventral rami C5-C7

* innervates pectoralis minor, pectoralis major

A

Lateral pectoral

33
Q
  • originates from ventral rami C8-T1

* innervates skin on medial brachium to medial epicondyle & olecranon

A

Medial brachial cutaneous

34
Q
  • originates from ventral rami C8-T1

* innervates skin on medial antebrachium to wrist

A

Medial antebrachial cutaneous

35
Q
  • originates from ventral rami C5-C6

* innervates skin over lower deltoid mm & lateral side of mid-arm

A

Superior brachia cutaneous

36
Q
  • originates from ventral rami C5-C6

* innervates skin n inferolateral aspect of arm

A

Inferior brachial cutaneous

37
Q
  • originates from ventral rami C5-C8

* innervates skin on posterior arm as far as olecranon

A

Posterior brachial cutaneous

ANAT100 (8 decks)

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