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Anatomy Week 1 > Superficial Back/Shoulder/Scapular Region > Flashcards

Superficial Back/Shoulder/Scapular Region Flashcards

1
Q

Superficial Posterior Axioappendicular Muscles

i.e. Extrinsic Shoulder Muscles

A
  1. Latissumus Dorsi

2. Trapezius

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2
Q

Latissimis Dorsi Nerve Supply

A

Thoracodorsal Nerve

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3
Q

Latissimus Dorsi Function

A

Extend; adduct; medially rotate the humerus @ the shoulder joint

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4
Q

Latissimus Dorsi Attachments

A 
Proximal: 
- spinous processes of thoracic vertebra below T6
- thoracolumbar fascia
- iliac crest
- Lower 3 or 4 ribs
Distal:
- humerus intertubercular groove
	- fibers twist as they converge toward the humoral insertion
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5
Q

Trapezius Nerve Supply

A

Accesory Nerve (Cranial Nerve XI)

C3 & C4 (spinal nerves)

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6
Q

Trapezius Function

A

a. Upper fibers –> elevate scapula
- in rotating the scapula helps the serratus anterior in making abduction of the humerus >90 degrees possible
b. Middle Fibers –> retract scapula
c. Lower Fibers –> depress scapula

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7
Q

“Droopy” shoulder injury

A

A paralysis of the trapezius muscle resulting from an injury to the accessory (aka cranial XI) nerve

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8
Q

Deep Axioappendicular Muscles

Extrinsic Shoulder Muscles

A
  1. Levator Scapulae
  2. Rhomboidei (major & minor)
  3. Serratus Anterior
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9
Q

Levator Scapulae nerve supply

A

Dorsal Scapular Nerve

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10
Q

Levator Scapulae function

A

elevate and fix the scapula

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11
Q

Rhomboid (major and minor) nerve supply

A

Dorsal Scapular Nerve

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12
Q

Rhomboid function

A

Retract and elevate the scapula

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13
Q

Serratus Anterior Nerve Supply

A

Long Thoracic Nerve

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14
Q

Serratus Anterior function

A

Protracts the scapula holds it against the thoracic wall

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15
Q

Paralysis of the Serratus Anterior

A

Due to problem with long thoracic nerve. Results in Winged Scapula

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16
Q

Scapulohumeral Muscles

Intrinsic Shoulder Muscles

A
  1. Deltoid
  2. Teres Major
  3. Superspinatus
  4. Infraspinatus
  5. Teres Minor
  6. Subscapularis
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17
Q

Deltoid nerve supply

A

Axillary nerve

18
Q

Deltoid functions

A

a. Anterior Fibers: flex & medially rotate
b. Middle Fibers: chief abductor of the humerus
c. Posterior Fibers: extend & laterally rotate the humerus

19
Q

Teres Major nerve supply

A

Lower Subscapular Nerve

20
Q

Teres Major functions

A

Adducts and medially rotate the humerus

21
Q

Supraspinatus nerve supply

A

Suprascapular Nerve

22
Q

Supraspinatus functions

A

Abducts the humerus

23
Q

Infraspinatus nerve supply

A

suprascapular nerve

24
Q

Infraspinatus functions

A

laterally rotates the humerus

25
Q

Teres Minor nerve supply

A

Axillary Nerve

26
Q

Teres Minor functions

A

Laterally rotates the humerus

27
Q

Subscapularis nerve supply

A

Subscapular Nerve (upper and lower)

28
Q

Subscapularis functions

A

medially rotates the humerus

29
Q

Other muscles of the shoulder region

A

Omohyoid muscle

30
Q

Omohyoid nerve supply

A

Cervical nerves 1, 2, 3

31
Q

Omohyoid functions

A

depresses, retracts, and steadies the hyoid bone

32
Q

Arteries

A

Blood supply arises from branches of the subclavian artery and the 3rd part of the axillary artery

33
Q

Branches of the subclavian artery

A

1st branch into the thyrocervical trunk and further into:

a. Transverse cervical artery (deep branch)
b. Dorsal scapular artery
c. Suprascapular artery

34
Q

Branches of the axillary artery

A
  1. subscapular artery arises from the 3rd branch of axillary artery
    • Circumflex Scapular Artery is a branch of the Subscapular artery
35
Q

Accessory Nerve/ CN XI

A

Enervates Trapezius

36
Q

Suprascapular Nerve

A

Enervates Supraspinatus & Infraspinatus

37
Q

Axillary Nerve

A

Enervates Deltoid and Teres Minor

38
Q

Dorsal Scapular Nerve

A

Enervates Rhomboid (major & minor) & Levator Scapulae

39
Q

Thoracodorsal Nerve

A

Enervates Latissimus Dorsi

40
Q

Lower Subscapular Nerve

A

Enervates Teres Major

41
Q

Long Thoracic Nerve

A

Enervates Serratus Anterior

Anatomy Week 1 (5 decks)

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