Superficial Back Muscles O/I/A Flashcards Preview

Gross Anatomy I > Superficial Back Muscles O/I/A > Flashcards

Flashcards in Superficial Back Muscles O/I/A Deck (20)
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1
Q

Trapezius (Medial attachment) Origin (5 points)

A

Origin:

  • Medial 1/3 of sup. nuchal line
  • external occipital protruberance
  • ligamentum nuchae
  • spinous proc. of C7
  • all thoracic vertebrae
2
Q

Trapezius (Lateral Attachment) Insertion (3 points)

A

Insertion

  • Lat. 1/3 of clavicle
  • Acrominon Proc
  • Spine of scapula
3
Q

Trapezius Actions

A

Stabilizes, raises, retracts and rotates the scapula

  • Sup. fibers elevate
  • Mid. fibers retract
  • Inf. fibers depress
  • Sup + inf. fibers = Rotation
4
Q

Trapezius Innervation

A
  1. Accessory (XI)
  2. Ventral Rami of C3/C4
5
Q

Levator Scapulae Origin (medial attachment)

A

Trans. proc of C1-C4

6
Q

Levator Scapulae Insertion

A

Vertebral border of the scapula b/t superior angle and the spine

7
Q

Levator Scapulae Actions (5)

A
  1. Raises the scapula
    1. And draws it medially
  2. W/ scapula fixed:
    1. Bend neck laterally
    2. Rotates it to the same side
  3. Extends the neck
8
Q

Levator Scapulae Innervation

A
  1. C3-C4 spinal nerves
  2. Dorsal scapular nerve (C3-C5)
9
Q

Rhomboid Major Origin (medial atachment)

A

Spinous proc. of T2-T5

10
Q

Rhomboid Major Insertion (lat. attachment)

A

Medial border of scapula b/t spine and inf. angle

11
Q

Rhomboid Major Actions (4)

A
  1. Adducts scapula
  2. Retracts scapula
  3. Elevates scapula
  4. Rotates scapula

*Does so that the glenoid cavity faces downward & stabilizes the scapula*

12
Q

Rhomboid Major Innervation

A

Dorsal Scapular nerve (C5)

13
Q

Rhomboid Minor Origin

A

Spinous proc. of C7-T1

14
Q

Rhomboid Minor Insertion

A

Medial border of the scapula at the root of the spine (superior part of scapula, sup. to rhomboid maj.)

15
Q

Rhomboid Minor Actions

A

Retracts/Stabilizes the scapula

Elevates verterbral border

Rotates scapula to depress the inf. angle

16
Q

Rhomboid Minor Innervation

A

Dorsal Scapular Nerve (C5)

17
Q

Lat. Dorsi Origins

A
  1. Indirect attachment through lumbodorsal fascia into spinous proc. of T7-L5
  2. Lower 3-4 ribs
  3. Illiac crest
18
Q

Lat Dorsi Insertion

A

In floor of intertubercular groove of humerus

19
Q

Lat Dorsi Actions (3)

A
  1. Adduct
  2. Extend
  3. Medially rotate arm

**Like being handcuffed**

20
Q

Lat. Dorsi Innervation

A

Thoracordorsal nerve (C6-C8)