ANP 300 Muscles of the Back and Limbs

ANP 300 Muscles of the Back and Limbs - ANP 300 Muscles of...

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ANP 300 Sarah Song Muscles of the Back and Limbs Extrinsic Muscles of the Back Name Components Innervation Location Attachment Sites Action Trapezius Accessory (XI) Cranial Nerve Extrinsic Back From occipital bone of the skull, Ligamentum nuchae, Spines of the thoracic vertebrae. Inserts onto the spine, Acromion processes of the scapula, Part of the clavicle. Fixes, elevates, and rotates the scapula. Extends the head Latissimus dorsi Thoracodorsal nerve (C6-C8) Extrinsic Back From spines of vertebrae from T7 to sacrum, Iliac crest, Two ribs. Inserts onto the intertubercular sulcus of the humerus. Extends, adducts, and medially rotates the arm Levator Scapulae Dorsal scapular nerve (C5) Extrinsic Back From transverse processes of C1-C4. Inserts onto the medial border of the scapula above the root of the spine. Fixes and elevates the scapula. Flexes the neck laterally Rhomboideus R. minor R. major Dorsal scapular nerve Extrinsic Back From spine of T1. From spines of T2-T5. Fixes, retracts, and rotates the scapula
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(C5) Insert onto the medial border of the scapula. Quadratus lumborum Spinal nerves Extrinsic Back From iliolumbar ligament, Iliac crest. Inserts onto the transverse processes of L1-L4, Lowermost rib. Laterally flexes the spine. Forms part of the posterior abdominal wall. Superficial Intrinsic Muscles of the Back Name Components Innervation Location Attachment Sites Action Splenius S. cervicis S. capitis Middle and lower cervical nerves Superficial Intrinsic Back From spines of T1-T6, Lower part of the ligamentum nuchae. Inserts onto the transverse processes of C1-C4. Inserts onto the lateral aspect of the mastoid process, Lateral part of the superior nuchal line of the skull. Laterally flexes and rotates the head and neck Erector spinae Iliocostalis (Lateral Column) Spinal nerves that emerge at levels Superficial Intrinsic Common origin to lower six ribs, Lower six ribs to upper six ribs, Extends and laterally flexes the spine
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ANP 300 Sarah Song Muscles of the Back and Limbs “If you SPIN for LONG enough, you’ll get ILL” Longissimus (Intermediate Column) Spinalis (Medial Column) crossed by the muscle fibers Back Upper six ribs to the transverse processes of the lower cervical vertebrae. Common origin to the transverse processes of the thoracic vertebrae, To transverse processes of the cervical vertebrae, To the mastoid process of the skull. From spines of lumbar vertebrae to those of upper thoracic vertebrae between L2 and T2. Upper part extends or rotates the head Extends the vertebral column
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Deep Intrinsic Muscles of the Back Name Components Innervation Location Attachment Sites Action Semispinalis Semispinalis Divided into S. thoracis and S. cervicis Semispinalis Capitis Spinal nerves that emerge at levels crossed by the muscle fibers Deep Intrinsic Back Fibers run upwards and medially between T12 and C2 from the transverse processes to the spines of superior vertebrae. From
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ANP 300 Muscles of the Back and Limbs - ANP 300 Muscles of...

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