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CHI282 - Human Anatomy 2 > Lecture 10- Extrinsic Back Muscles > Flashcards

Lecture 10- Extrinsic Back Muscles Flashcards

0
Q

Superficial extrinsic

•Produce & control …….. …… …….

A

upper limb movements

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1
Q

Superficial extrinsic
•Posterior axio-appendicular muscles => connect …… skeleton with ……. …….. skeleton (pectoral girdle and humerus).

A

axial

superior appendicular

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2
Q

Superficial extrinsic

•Mostly innervated by ……. …….. of cervical spinal nerves (despite being dorsal muscles!).

A

anterior rami

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3
Q

Superficial extrinsic muscles

•Include:

A
  • Trapezius
  • Latissimus dorsi
  • Levator scapulae
  • Rhomboid major
  • Rhomboid minor
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4
Q

Trapezius

Proximal attachment

A

Meidal third of superior nuchal line; external occiptal protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae

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5
Q

Trapezius

Distal attachment

A

Lateral third of clavicle; acromion and spine of scapula

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6
Q

Trapezius

Innervation

A

Motor: Spinal accessory nerve (CN XI)
Sensory: C3 & C4 spinal nerves

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7
Q

Trapezius

Main actions

A

Descending part elevates; ascending part depresses; middle part (or all parts together) retracts scapula;
Descending and ascending parts together rotate glenoid cavity superiorly.

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8
Q

Latissimus dorsi

Proximal attachment

A

Spinous processes of T7 to T12, thoracolumbar fascia, iliac crest, ribs 10-12

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9
Q

Latissimus dorsi

Distal attachment

A

Floor of intertubular sulcus of humerus

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10
Q

Latissimus Dorsi

Innervation

A 
Thoracodorsal nerve
(C6, C7, C8)
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11
Q

Latissimus Dorsi

Main Action

A

Extends, adducts and medially rotates humerus

Raises body toward arms during climbing

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12
Q

Levator scapulae

Proximal attachment

A

Posterior tubercles of transverse processes of C1-C4 vertebrae

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13
Q

Levator scapulae

Distal attachment

A

Medial border of scapula superior to root of scapular spine

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14
Q

Levator Scapula

Innervation

A

Dorsal scapular (C5) and cervical (C3, C4) nerves

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15
Q

Levator scapulae

Main actions

A

Elevates scapula

Tilts glenoid cavity inferiorly (by rotating scapula)

16
Q

Rhomboid major

Proximal attachment

A

Spinous processes

of T2-T5 vertebrae

17
Q

Rhomboid Major

Distal attachment

A

Medial border of scapula from level of spine to inferior angle

18
Q

Rhomboid Major

Innervation

A

Dorsal scapular nerve

C4, C5

19
Q

Rhomboid Major

Main actions

A

Retracts scapula and rotate it to depress glenoid cavity

Fix scapula to thoracic wall

20
Q

Rhomboids minor

Proximal attachment

A

Nuchal ligament

Spinous processes of C7 & T1 vertebrae

21
Q

Rhomboid Major

Distal attachment

A

Smooth triangular area at medial end of scapular spine

22
Q

Rhomboid Minor

Innervation

A

Dorsal scapular nerve

C4, C5

23
Q

Rhomboid Minor

Main actions

A

Retracts scapula and rotate it to depress glenoid cavity

Fix scapula to thoracic wall

24
Q

Rhomboid Minor

Intermediate extrinsic

A
  • Serratus posterior superior

* Serratus posterior inferior

25
Q

Intermediate extrinsic
No what?
Innervation?

A

No respiratory function

Innervated by intercostal nerves.

26
Q

Serratus posterior superior

Superior attachment

A

Nuchal ligament, spinous processes of C7 to T3

27
Q

Serratus posterior superior

Inferior attachment

A

Superior borders of 2nd to 4th ribs

28
Q

Serratus posterior superior

Innervation

A

2nd to 5th intercostal nerves

29
Q

Serratus posterior superior

Main action

A

Proprioception

(Elevates ribs)

30
Q

Serratus posterior inferior

Superior attachment

A

Spinous processes

of T11 to L2

31
Q

Serratus posterior inferior

Inferior attachment

A

Inferior borders of 8th to 12th ribs near their angles

32
Q

Serratus posterior inferior

Innervation

A

Anterior rami to T9 to T12 thoracic spinal nerves

33
Q

Serratus posterior inferior

Main Action

A

Proprioception

(Depress ribs)

34
Q

The thoracodorsal nerve innervates which extrinsic back muscle?

A

Latissimus Dorsi

35
Q

Which nerve provides motor innervation to trapezius?

A

Motor: Spinal accessory nerve (CN XI)

36
Q

What is the main action of levator scapulae?

A

Elevates the scapula

37
Q

Which nerve spinal cord segments contribute to the dorsal scapular nerve?

A

C4, C5

38
Q

What is the main action of the serratus posterior muscles?

A

Proprioception

CHI282 - Human Anatomy 2 (16 decks)

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