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Gross Lect. Midterm > Extrinsic Muscles > Flashcards

Extrinsic Muscles Flashcards

1
Q

Hypaxial muscle

A

All muscles except intrinsic muscles

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2
Q

Origin of Trapezius Muscle

A
  • 1/3 of superior nuchal line
  • external occipital protuberance
    -ligamentum nuchae
  • C7-T12
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3
Q

Insertion of the descending fibers of Trapezius

A

1/3 of clavicle

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4
Q

Insertion of the middle fibers of Trapezius

A

Spine and acromion process of scapula

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5
Q

Insertion of the ascending fibers of Trapezius

A

Base of spine of scapula

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6
Q

Innervation of Trapezius

A

Subtrapezial plexus:
- Motor: CNXI accessory nerve
- Sensory: C3-C4 ventral rami

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7
Q

Blood Supply for Trapezius

A

Descending fibers: occipital artery
Middle fibers: transverse cervical artery
Ascending fibers: dorsal scapula artery

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8
Q

Actions of Trapezius

A
  • Elevate the shoulders: Shrugging
  • depress scapula
  • elevate scapula
  • bilateral: extends head and neck
  • unilateral: ear to shoulder (ipsilateral)
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9
Q

Origin of Latissimus Dorsi

A
  • thoracolumbar fascia (spinous process of C7-L5 + posterior iliac crest)
  • bone (iliac crest lateral to erector spinae + lower 3-4 ribs)
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10
Q

Insertion of Latissimus Dorsi

A

Floor of bicipital groove

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11
Q

Innervation of Latissimus Dorsi

A

Thoracodorsal nerve fibers (C6-C8 ventral rami)

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12
Q

Blood supply of Latissimus Dorsi

A

Thoracodorsal artery

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13
Q

Actions of Latissimus Dorsi

A
  • extension of arm
  • adduction of arm
  • medial rotation of arm
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14
Q

Origin of Levator scapulae

A

T.P of C1-C4

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15
Q

Insertion of Levator scapulae

A

Medial border of scapula from superior angle to spine of scapula

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16
Q

Innervation of Levator Scapulae

A

C3-C4 ventral rami and dorsal scapular nerve C5

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17
Q

Blood supply of Levator Scapulae

A

Dorsal scapular artery

18
Q

Actions of Levator Scapulae

A
  • Elevates superior angle of scapula
  • Inferiorly rotates glenoid fossa
19
Q

Origin of Rhomboid Minor

A
  • Lower portion of ligamentum nuchae
  • S.P. of C7-T1
20
Q

Insertion of Rhomboid Minor

A

Medial border of scapula at base of spine

21
Q

Actions of Rhomboid Minor

A
  • Inferiorly rotates glenoid fossa
  • Retracts scapula
22
Q

Innervation of Rhomboid Minor

A

Dorsal scapular nerve (C4/C5)

23
Q

Blood Supply of Rhomboid Minor

A

Dorsal Scapular a.

24
Q

Origin of Rhomboid Major

A

S.P of T2-T5

25
Q

Insertion of Rhomboid Major

A

Medial border of scapula from base of spine to inferior angle

26
Q

Innervation of Rhomboid Major

A

Dorsal scapular n (C4/C5)

27
Q

Blood Supply of Rhomboid Major

A

Dorsal scapular A.

28
Q

Actions of Rhomboid major

A
  • Retract scapula
  • Inferiorly rotates the glenoid fossa
29
Q

Origin of Serratus Anterior

A

Ribs 1-8

30
Q

Insertion of Serratus Anterior

A

Anterior surface of medial border on scapula

31
Q

Actions of Serratus Anterior

A
  • protraction of scapula
  • elevation and upwards rotation of scapula w/ trapezius
32
Q

Origin of Serratus Posterior Superior

A
  • S.P of C7-T2/3
  • Ligamentum Nuchae
33
Q

Insertion of Posterior Serratus Superior

A

Ribs 2-5 lateral to angle

34
Q

Action of Serratus Posterior Superior

A

Lift ribs during inhalation

35
Q

Innervation of Serratus Posterior Superior

A

First 4 intercostal nerves (Ventral rami of T1-T4)

36
Q

Blood Supply of Serratus Posterior Superior

A

-Highest intercostal artery
- Posterior intercostal artery

37
Q

Origin of Serratus posterior inferior

A

Spinous processes of T11-L2

38
Q

Insertion of Serratus posterior inferior

A

Lower 4 ribs lateral to angle

39
Q

Action of Serratus Posterior Inferior

A

Depress lower ribs during inhalation

40
Q

Blood supply of Serratus posterior inferior

A

Posterior intercostal a.a

Gross Lect. Midterm (2 decks)

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