Back: Muscles, Innervations, & Blood Supply Flashcards
Trapezius M.
Layer 1
Insertion:
scapular spine, lateral 1/3 of clavicle, acromion, spinous process
Origin: Superior Nuchal Line, External Occipital Protruberance
Innervation: Spinal Accessory Nerve or Cranial Nerve 11
Blood Supply: Transverse Cervical Artery
Action: retract scapula, elevate scapula, depress scapula, rotate glenoid cavity superiorly
Latissmus Dorsi M.
Layer 1
Insertion: intertubercular groove of the humerus
origin: Spinous Process of the t6-t12
Spinous Process of l1-l5
Iliac Crest
Median Sacral Crest of the Sacram
Action: medially rotate the humerus
adduct the humerus
extend the humerus (backwards thinking)
medially rotate the humerus
Innervation: Thoracodorsal Nerve
Blood Supply: Thoracodorsal Artery
Levator Scapulae M.
Layer 2
Origin: medial border of the scapula
Insertion: posterior tubercle of the transverse processes of the c1-c4 vertebrae
Action: elevate scapula, retract scapula, rotate glenoid cavity inferiorly (because its part of the scapula)
Innervation: Dorsal Scapular Nerve
Blood Supply: Dorsal Scapular Artery
Rhomboid Minor M.
Layer 2
Origin: spinous process of c7-t1
Insertion: medial border of the scapula
Action: retract scapula, elevate the scapula, rotate glenoid cavity inferiorly
Innervation: Dorsal Scapular Nerve
Blood Supply: Dorsal Scapular Artery
Rhomboid Major M.
Layer 2
Origin: spinous processes of t2-t5
Insertion: medial border of scapula
Action: retract scapula, elevate scapula, rotate glenoid cavity inferiorly
Innervation: dorsal scapular nerve
Blood Supply: dorsal scapular artery
Serratus Posterior Superior M.
Layer 3
Origin: spinous processes of c7-t3
Insertion: superior surface of ribs 2-5
Action: propioception, elevate the ribcage
Innervation: Intercostal Nerves of Ribs 2-5
Blood Supply: Superior Intercostal Artery
Serratus Posterior Inferior M.
Layer 3
Origin: Spinous Process of T11-L2
Insertion: Inferior Surface of the Ribs 8-12
Action: depress ribs during forced expiration, propioception
Innervation: Anterior Rami
Blood Supply: Lowest Posterior Intercostal Artery
Splenius Capitus M.
Layer 3 (start to get intrinsic)
Origin: lowest 1/2 of nuchal ligament
spinous process of c7-t3
Insertion: mastoid process of the temporal bone
Action: laterally flex the neck
extend the neck
Innervation: Dorsal Rami
Blood Supply: Occipital Artery??????
Splenius Cervicis M.
Layer 3 (start to get intrinsic)
origin: lowest 1/2 of nuchal ligament
spinous process of c7- t3
insertion: transverse processes of c1-c3
action: rotate the face laterally towards side of muscle
laterally flex the neck
Innervation: dorsal rami
Blood Supply: Occipital artery
Iliocostalis Cervicis M.
Layer 5 (deep intrinsic: apart of the erector spinae group)
Origin: costal angles of ribs 3-6
Insertion: posterior tubercle of transverse processes of c4-c6
Action: extend the neck, laterally flex the neck
Innervation: dorsal rami
Iliocostalis Thoracis M.
Layer 5 (deep intrinsic: a part of the erector spinae group)
Origin: costal angles of ribs 7-12
Insertion: Costal Angles of ribs 1-6
Action: maintain erect posture, extend the vertebral column
Innervation: dorsal rami
Iliocostalis Lumborum M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: lateral sacral crest
Insertion: costal angles of ribs 7-12
Action: maintain erect posture
Innervation: dorsal rami
Longissimus Capitis M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: transverse process of T1-T5
Insertion: Mastoid process of temporal bone
Action: flex the neck toward the muscle, rotate the neck toward the muscle
Innervation: Dorsal Rami
Longissimus Cervicis M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: transverse processes of t1-t5
Insertion: posterior tubercles of transverse processes and articular processes of c2-c6
action: laterally flex the neck, extend the neck
innervation: dorsal rami
Longissimus Thoracis M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: Intermediate Sacral Crest
Insertion: Ribs 3-12 of costal angles
Action: maintain erect posture
Innervation: dorsal rami
Spinalis Capitis M.
Layer 5 (deep intrinsic: part of erector spinae group)
Origin: spinous processes of C7
Insertion: external occipital protuberance
Action: extend the neck, laterally flex the vertebrae of the cervical region
Innervation: Dorsal Rami
Spinalis Cervicis M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: spinous process of c7
Insertion: spinous process of c2
action: extend the neck (bilaterally)
Innervation: Dorsal Rami
Spinalis Thoracis M.
Layer 5 (deep intrinsic: part of the erector spinae group)
Origin: spinous process of T11-L2
Insertion: spinous processes of T1-T8
Action: Maintain erect posture, extend the vertebral column
Innervation: Dorsal Rami
Semispinalis Capitis M.
Layer 6 (deep intrinsic: Transversospinalis Group)
Origin: transverse process of C7-T6
Insertion: between superior and inferior nuchal line
Action: Extend the head, rotate the face
Innervation: Dorsal Rami
Semispinalis Cervicis M.
Layer 6 (deep intrinsic: Transversospinalis Group)
Origin: transverse processes of T1-T6
Insertion: Spinous Processes of C2-C5
Action: Extend the spine, rotate the spine away
Innervation: Dorsal Rami
Semispinalis Thoracis M.
Layer 6 (deep intrinsic: transversospinalis group)
Origin: transverse process of T6-T12
Insertion: spinous processes of C6-T4
Action: Extend the spine, rotate the spine away from the rib cage
Innervation: dorsal rami
Rectus Capitis Posterior Major M.
Insertion: Lateral aspect of inferior nuchal line of occipital bone
Origin: spinous process of axis
Action: extend the head, rotate the face toward you
Innervation: suboccipital Nerve
Rectus Capitis Posterior Minor M.
Insertion: inferior nuchal line of occipital bone
Origin: posterior tubercle of atlas
Action: extend the neck
Innervation: Suboccipital Nerve
Obliquus Capitis Superior M.
Insertion: between superior nuchal line and inferior nuchal line of occipital bone
Origin: transverse process of atlas
Action: extend the head, laterally flex the neck
Innervation: suboccipital nerve
Obliquus Capitis Inferior M.
Insertion: Transverse process of atlas
Origin: Spinous process of axis
Action: rotate the face toward muscle
Innervation: Suboccipital Nerve
