back myology Flashcards
Trapezius M:
Insertion, action, and innervation
Blood supply
- Clavicle, Acromion and Scapular Spine
- Action: Extend the neck, laterally flex the neck, and rotate the face away when working unilaterally.
- Innervation: CN11 and Sensory: C3, C4
- Transverse cervical artery
Latissimus Dorsi M.
Location, action, innervation
Blood supply
1.Floor of the Humeral Groove, spine, Iliac Crest.
2. Extend, ADduct, and medially rotate the humerus
Rotate the Glenoid Cavity inferiorly.
3. Thoracodorsal N. (C6-8)
4. Thoracodorsal A.
Location of Rhomboid Major M.
Spine and scapula
Action of Rhomboid Major M. (2)
Retract and Elevate scapula
Rotate the Glenoid Cavity inferiorly
Innervation and Blood supply Rhomboid Major M.
Dorsal Scapular N. (C4,5)
Dorsal Scapular A.
Location of Rhomboid Minor M.
Between Spine and medial border scapula
Action of Rhomboid Minor M.(2)
Retract and Elevate Scapula, Rotate the glenoid Cavity inferiorly.
Innervation and Blood supply of Rhomboid Minor M.
Dorsal Scapular N. (C4,5)
Dorsal Scapular A.
Location of Levator Scapulae M
Scapula and Transverse Process of C1-4
Action of Levator Scapulae M (3)
Elevate scapula, rotate the glenoid cavity inferiorly.
Extend and laterally flex the neck (when the scapula is fixed).
Innervation and blood supply of Levator Scapulae M
Dorsal Scapular N. (C3,4,5)
Dorsal Scapular A.
Location of Serratus Posterior Superior M.
Ribs and Spinous Processes.
Action of Serratus Posterior Superior M.
Elevate Ribs with forced inspiration
Innervation and blood supply of Serratus Posterior Superior M.
Intercostal N(2-5) Intercostal A.
Location of Serratus Posterior Inferior M.
Ribs and Spinous Processes
Action of Serratus Posterior Inferior M.
Depress Ribs with forced expiration
Innervation and blood supply of Serratus Posterior Inferior M.
Anterior Rami T9-12.
Intercostal A.
Location of Splenius Capitus M.
Temporal B, Occipital B, Spinous Process C7-T3
Action of Splenius Capitus M. (2)
Extend the neck when working bilaterally
Laterally flex the neck and rotate face toward when working unilaterally.
Innervation and blood supply of Splenius Capitus M.
Posterior Rami (C3-5) Muscular branches of Aorta.
Location of Splenius Cervicis M.
below Splenius Capitus M
Action of Splenius Cervicis M. (2)
Extend the neck when working bilaterally.
Laterally flex the neck and rotate face toward when working unilaterally.
Innervation and blood supply of Splenius Cervicis M.
Posterior Rami (C5-7) Occipital A. and Transverse Cervical A.
What are the 3 main muscles of the Erector Spine Group?
What are their actions? (2)
- Iliocostalis
- Longissimus
- Spinalis
Action: maintain erect posture and extend the vertebral column and head when working bilaterally; laterally flex the vertebral column when working unilaterally.
Innervation of all Erector Spinae Group M.
Posterior Rami
Action of Semispinalis Thoracis M.
Extend Spine and rotate spine away.
Innervation of Semispinalis Thoracis M.
Posterior Rami
Enumerate the muscles of Tranversospinalis Group
- Semispinalis Group
- Multifidus M.
- Rotatores Longus M.
- Rotatores Brevis M.
Semispinalis Cervicis M Action
Extend Spine and Rotate spine away.
Innervation of semispinalis cervicis M.
Posterior Rami
Action of Semispinalis Capitis M.
Extend head, rotate face away.
Innervation of Semispinalis Capitis M
posterior Rami
Action of Multifidus M
Extend spine, rotate the spine away.
Innervation of Multifidus M.
Posterior Rami
Action of Rotatores Longus M
Extend spine, rotate the spine away
Innervation of Rotatores Longus M
Posterior Rami
Action of Rotatores Brevis M
Extend spine, rotate the spine away.
Innervation of Rotatores Brevis M
Posterior Rami
Action of Interspinalis M
Extend Spine
Innervation of Interspinalis M
Posterior Rami
Action of Intertransversarii M
Laterally Flex Spine
Innervation of Intertransversarii M
Posterior/ Anterior Rami
Action of Rectus Capitis Posterior Major M.
Extend head, rotate face toward
Innervation of Rectus Capitis Posterior Major M.
Suboccipital N.
Action of Rectus Capitis Posterior Minor M
Extend head
Innervation of Rectus Capitis Posterior Minor M
Suboccipital N
Action of Obliquus Capitis Inferior M
Rotate the face toward
Innervation of Obliquus Capitis Inferior M
Suboccipital N
Action of Obliquus Capitis Superior M
Extend and laterally flex head
Innervation of Obliquus Capitis Superior M
Suboccipital N
