Superficial and Deep Back Flashcards
1
Q
Trapezius
A
- O: external occipital protuberance, superior nuchal line of occipital bone, ligamentum nuchae, spinous processes of C7, T1-12 vertebrae
- I: Lateral 1/3 of clavicle, Acromion, spine of scapula
- A: elevates, retracts, and rotates scapula upward
- N: spinal accessory (CN XI) supplies the motor innervation and ventral rami of C3, C4 supply sensory fibers.
2
Q
Latissimus Dorsi
A
- O: spines (spinous process) of lower 6 thoracic vertebrae, lumbodorsal (thoracolumbar) fascia (TLF), crest of ilium, muscular slips from lower 3 or 4 ribs
- I: floor of intertubercular groove of humerus
- A: extends, adducts, and medially rotates humerus
- N: thoracodorsal (middle Subscapular), C6-C8
3
Q
Rhomboid Major
A
- O: spines T2-T5
- I: medial border of scapula between spine and inferior angle
- A: adducts and rotates scapula downward.
- N: dorsal scapular, C5
4
Q
Rhomboid Minor
A
- O: ligamentum nuchae, spines C7-T1
- I: root of scapular spine
- A: adducts and rotates scapula downward
- N: dorsal scapular, C5
5
Q
Levator Scapulae
A
- O: transverse process of atlas (C1), axis (C2), C3-C4
- I: superior angle, medial border of scapula
- A: elevates and rotates scapula downward.
- N: C3, C4; dorsal scapular C5
6
Q
Serratus Posterior Superior
A
• O: inferior portion of ligamentum nuchae and spinous processes of C7-T3
• I: superior borders of ribs 2-4 (sometimes 5)
• A: elevates superior ribs, aids in weak inspiration
• N: intercostals Nn
(underneath Rhomboids)
7
Q
Serratus Posterior Inferior
A
• O: spinous processes of T11-12 and L1-2
• I: inferior borders of ribs 9-12
• A: depresses ribs 9-12, aids in weak inspiration
• N: intercostals Nn
(Underneath Lats)
8
Q
Serratus Anterior
A
- O: lateral surface of 1st to 8th ribs
- I: anterior (or costal) surface of medial (vertebral) border of scapula
- A: protracts (abducts) and rotates scapula upward; fixes scapula against thorax; raises ribs when scapula is fixed. Push-off test – wing scapula, or comparison of both side
- N: long thoracic n, C5-7
9
Q
Splenius Capitis
A
- O: ligamentum nuchae, spines C7, T1-3
- I: lateral part of occipital bone, mastoid of temporal bone
- A: Alone: side bend to same side, together, extend head and neck
- N: dorsal rami of inferior cervical Nn
10
Q
Splenius Cervicis
A
- O: Spines T3-T6
- I: Transverse processes of C1-C3
- A: Alone: side bend and rotate neck to same side, together, extend head and neck
- N: dorsal rami of inferior cervical Nn
11
Q
Illiocostalis
A
O: Illiac crest
I: ribs
12
Q
Longissimus
A
O: Transverse processes of inferior vertebrae
I: Transverse processes of superior vertebrae
13
Q
Spinalis
A
- O: Spines of inferior vertebrae
- I: Spines of superior vertebrae
- Combined actions: extend vertebral column or side bend to same side
- Nn: All are innervated by posterior rami
14
Q
Semispinalis capitis
A
- O: Transverse processes C7-T7
- I: Area between superior and inferior nuchal lines
- A: Together extend head, unilaterally-side bend to same side, rotate to opposite side.
- N: dorsal rami of cervical spinal Nn
15
Q
Semispinalis cervicis
A
- O: Transverse processes T1-T5
- I: spinous processes 4-6 segments above
- A: Together extend vertebral column, unilaterally-side bending neck ipsilaterally and rotate neck to the opposite side (kind of like action of the SCM muscle)
- N: dorsal rami
