Muscles of the back

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Trapezius M. function
- Elevation, retraction, and rotation of scapula.
- Helps in adduction and slight elevation of arm.
Trapezius M. innervation

Accessory N. (CNXI) and C3-C4 (propioception and pain)
Rhomboid Minor/Major M. function
- Press the scapula to the thoracic wall.
- Retraction of scapula medially.
Rhomboid Minor/Major M. innervation

Dorsal scapular N. (C4-C5)
Leavtor Scapulae M. function

Elevates the scapula.
Levator Scapulae M. innervation

Dorsal scapular N. (C4-C5)
Latissimus dorsi M. function
- Adduction and lowering the arm.
- Medial rotation and extension of the arm.
- Raises the body toward the arm when climbing.
Latissimus dorsi M. innervation

Thoracodorsal (C6, C7, C8)
Serratus posterior inferior/superior M. function
- Rib elevation
- *May function as accessory muscles of respiration (in COPD).
Serratus posterior inferior/superior M. innervation

Intercoastal N. (T9-T12)
Erector Spinae lateral M. function
- Erect posture of the body.
- Splenii rotate the head.
- Extensors when both sides contract.
- Flexion when one side contracts.
Erector Spinae lateral M. innervation

Primary spinal dorsal rami.
Erector Spinae medial M. function
- Extensors when both sides contract.
- Flexors when one side contracts.
- Some stabilize and some rotate the vertebral column.
Erector Spinae medial M. innervation

Primary dorsal rami.
Suboccipital triangle function

Turning the head backward or laterally.
Suboccipital triangle innervation
- Sensory: Greater occipital N (C2)
- Suboccipital N (C1) innervates all 3 muscles
Suboccipital triangle contents
- Third part of vertebral artery.
- Suboccipital N (C1) innervating all 3 muscles.
- Suboccipital plexus of veins.

Author

ebcross88

32919

Card Set

Muscles of the back

Description

Muscle innervation and function of the back.

Updated

2010-09-07T13:47:40Z

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