University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

457

Pages:

3
Author:

Mariam A. A.

Muscles of the back part 2 Transversospinalis groups (oblique muscles) Muscles Origin Semispinalis Articular processes of vertebrae C4-C7, transverse processes of vertebrae T1-T6 Multifidus • • • Rotatores • • Multifidus cervicis: Superior articular processes of vertebrae C4-C7 Multifidus thoracis: Transverse process of thoracic vertebra Multifidus lumborum: Mammillary processes of lumbar vertebrae, posterior aspect of sacrum, posterior superior iliac spine (PSIS) of ilium and posterior sacroiliac ligamen Insertion Between superior and inferior nuchal lines of occipital bone Innervation Descending branches of greater occipital nerve (C2) and spinal nerve C3 Lateral aspect and tips of the spinous processes of vertebrae 2-5 levels above origin Medial branches of posterior rami of spinal nerves • Rotatores breves: Transverse processes of vertebrae T2-T12 Rotatores longi: Transverse processes of thoracic vertebrae • Medial branches Rotatores of posterior rami breves: Laminae/Spinous of spinal nerves process of vertebra (1 level above origin) Rotatores longi: Laminae/Spinous process of vertebra (2 levels above origin) Function Bilateral contraction extension of head, cervical and thoracic spine Unilateral contraction lateral flexion of head, cervical and thoracic spine (ipsilateral), rotation of head, cervical and thoracic spine (contralateral) • Bilateral contraction: Extension of spine • Unilateral contraction: Lateral flexion of spine (ipsilateral), rotation of spine (contralateral) • • Bilateral contraction: Extension of thoracic spine Unilateral contraction: Rotation of thoracic spine (contralateral) Ungrouped deep muscles. Muscles Splenius Interspinales Origin Spinous processes of vertebrae C7-T3, nuchal ligament • • • Intertransversarri • • Levator costarum Interspinales cervicis: Superior aspect of spinous processes of vertebrae C3-T1 Interspinales thoracis: Superior aspect of spinous process of vertebrae T2, T11 & T12 (variable) Interspinales lumborum: Superior aspects of spinous processes of vertebrae L2-L5 Lateral lumbar intertransversarii: Transverse and accessory processes of vertebrae L1-L4 Medial lumbar intertransversarii: Accessory processes of vertebrae L1-L4 Transverse processes of the C7 – T11 Insertion Lateral superior nuchal line of occipital bone, mastoid process of temporal bone • Interspinales cervicis: Inferior aspect of spinous processes of vertebrae C2-C7 • Interspinales thoracis: Inferior aspect of spinous processes of vertebrae T1, T10 & T11 • Interspinales lumborum: Inferior aspects of spinous processes of vertebrae L1-L4 • Lateral lumbar intertransversarii: Transverse process of succeeding vertebra • Medial lumbar intertransversarii: Mammillary processes of succeeding vertebra Superior border/external surface of rib one level below origin Innervation Lateral branches of posterior rami of spinal nerves C2-C3 Posterior rami of spinal nerves Function • Bilateral contraction: Extends head/neck • Unilateral contraction: Lateral flexion and rotation of head (ipsilateral) Extension of cervical and lumbar spine Anterior rami of spinal nerves Assists lateral flexion of the spine; Stabilizes spine Posterior rami of spinal nerves T1 – T12 • • Elevation of the ribs Rotation of thoracic spine