Tufts DPT Anatomy: Week 5 origins, insertions, innervations

Upper Trapezius

Origin:

Insertion:

Innervation: Spinal Accessory nerve (IX)

Action:

Superficial

Middle Trapezius

Origin:

Insertion:

Innervation: Spinal Accessory Nerve

Action:

Superficial

Lower Trapezius Nerve

Origin:

Insertion:

Innervation: Spinal Accessory Nerve

Action:

Superficial

Latissimus Dorsi

Origin:

Insertion:

Innervation: Thoracodorsal nerve

Action: Humeral extension, adduction and internal rotation

Superficial

Levator Scapulae

Origin:

Insertion:

Innervation: Dorsal Scapular nerves and cervical nerves

Action: Elevates and rotates scapula (glenoid fossa)

Superficial

Rhomboid Major and Minor

Origin:

Insertion:

Innervation: Dorsal Scapular nerve

Action: retracts, stabilizes and rotates scapula (glenoid fossa)

Superficial

Serratus posterior superior

Origin:

Insertion:

Innervation: Intercostal nerves

Action: Elevates ribs 2-5

Intermediate

Serratus posterior inferior

Origin:

Insertion:

Innervation: Thoracic spinal nerves

Action: brings lower ribs downward

Intermediate

Splenius Capitis

Origin:

Insertion:

Innervation: Lateral branches of 2nd and 3rd cervical dorsal rami

Action: Unilaterally causes ipsilateral rotation of head, bilaterally causes extension

Superficial deep layer

Splenius Cervicis

Origin:

Insertion:

Innervation: Lateral branches of lower cervical dorsal rami

Action: Unilaterally causes ipsilateral rotation of upper cervical vertebrae, bilaterally causes extension

Superficial deep layer

Erector Spinae group muscles:

iliocostalis

longissimus

spinalis

Iliocostalis: lumborum, thoracis, cervicis

Origin:

Insertion:

Innervation: Dorsal rami of spinal nerves

Action: Unilateral side bend, bilateral extension

intermediate deep layer

Longissiumus: thoracis, cervicis, capitus

Origin:

Insertion:

Innervation: Dorsal Rami of spinal nerves

Action: Unilateral side bend, bilateral extension

intermediate deep layer

Spinalis: Thoracis, cervicis, capitus

Origin:

Insertion:

Innervation: Dorsal Rami of spinal nerves

Action: Unilateral side bend, bilateral extension

intermediate deep layer

Transversospinalis group muscles:

semispinalis

multifidus

rotatores

Transversospinalis group:

Origin: transverse process of inferior vertebrae

Insertion: spinous process of superior vertebrae

Innervation: Dorsal Rami of spinal nerves

Action: extension, rotation, stabilization

Deep of deep layer

Minor deep layer of deep layer muscles:

Interspinalis

intertransversarri

elevator costorum

Suboccipital muscles:

Rectus capitus posterior minor

Rectus capitus posterior major

Obliquus capitus superior

Obliquus capitus inferior

innervate by suboccipital nerve (C1)

Suboccipital triangle contents:

vertebral artery and suboccipital nerve (C1)

What forms the vertebral arch

Pedicles and Lamina

What forms the zygopophyseal joint (facet)

two superior and two inferior articular processes

What forms the intervertebral foramen

Superior and inferior vertebral notch

Cervical Vertebrae Facet angle

45 degrees

allows for mobility

Thoracic Facet angle

60 degrees

allows for lateral flexion and rotation and flexion

limits extension

Lumbar facet angle

90 degrees

allows for flexion/extension and slight side bending

limits rotation