Muscular System

1 DORSAL MUSCLES. Musculi dorsi. The muscles of the back. True back muscles are innervated by the dorsal rami of spinal nerves, whereas the muscles of the shoulder girdle are not. ABC

2 M. trapezius. o: Spinous processes of vertebrae T1-T12 and C1, the nuchal ligament, occipital protuberance, and superior nuchal line. i: Spine of scapula, acrimonion, and clavicle. A: Rotates, raises, lowers, and adducts the scapula; rotates the head. I: Accessory nerve, cervical plexus. A

3 M. transversus nuchae. (Rare, 25%). Platysmal muscle situated between the insertions of the trapezius and sternocleidomastoid. It passes transversely, either superficial or deep, to the trapezius. A

4 M. latissimus dorsi. o: Thoracolumbar fascia, spinous processes of vertebrae T7-L5, sacrum, iliac crest, and four lower ribs. i: Crest of lesser tubercle of humerus. A: Adduction and medial rotation of the arm. I: Thoracodorsal nerve. A

5 M. rhomboideus major. o: Spinous processes of vertebrae T1-4. i: Medial margin of scapula. A: Medial and upward movement of scapula. I: Dorsal scapular nerve. A

6 M. rhomboideus minor. o: Spinous processes of cervical vertebrae 6-7. i: Medial margin of scapula above the spine. A: Medial and upward movement of scapula. I: Dorsal scapular nerve. A

7 M. levator scapulae. o: Posterior tubercle of transverse processes of cervical vertebrae 1-4. i: Superior angle of scapula. A: Elevates superior angle of scapula and rotates neck. I: Dorsal scapular nerve and cervical plexus. A

8 M. serratus posterior inferior. o: Spinous processes of vertebrae T11-L2. i: Four lower ribs. A: Retroversion of four lower ribs. I: Intercostal nerves. A

9 M. serratus posterior superior. o: Spinous processes of vertebrae C6-T2. i: Second to fifth ribs. A: Raises ribs in inspiration. I: Intercostal nerves. AB

10 M. ERECTOR SPINAE. Collective term for the muscles of the lateral and medial tracts of the back. I: Posterior rami of spinal nerves. o: Iliac crest, spinous processes of L1-S4, mamillary processes of L1-2, transverse processes ofT7-12. i: Costal and accessory processes of lumbar vertebrae, angle of 11 lower ribs, all thoracic transverse processes. A: Lateral and backward flexion of vertebral column. B C

10a [[Lateral tract]]. [Tractus laterale].

11 M. longissimus. It consists of the following three parts. B

12 M. longissimus thoracis. o: Iliac crest, spinous processes of L1-S4, mamillary processes of L1-2, transverse processes of T7-I2. i: Costal and accessory processes of lumbar vertebrae, angle of lower 11 ribs all thoracic transverse processes, A: Lateral and backward flexion of vertebral column. B C

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