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The serratus posterior inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk. [1] This movement of the ribs may also contribute to inhalation and forced expiration of air from the lungs. [2]
The serratus posterior inferior and serratus posterior superior are innervated by the ventral primary ramus and are hypaxial muscles. Epaxial muscles include other (dorsal) muscles associated with the vertebrae, ribs, and base of the skull.
The lateral branches increase in size from above downward. They run through or beneath the Longissimus dorsi to the interval between it and the Iliocostales, and supply these muscles; the lower five or six also give off cutaneous branches which pierce the Serratus posterior inferior and Latissimus dorsi in a line with the angles of the ribs.
The serratus posterior superior muscle arises by an aponeurosis from the lower part of the nuchal ligament, from the spinous processes of C7, T1, T2, and sometimes T3, and from the supraspinal ligament. [2] It is inserted, by four fleshy digitations into the upper borders of the second, third, fourth, and fifth ribs past the angle of the rib. [2]
Serratus posterior may refer to: Serratus posterior superior muscle , a thin, quadrilateral muscle, situated at the upper and back part of the thorax Serratus posterior inferior muscle , a muscle that lies at the junction of the thoracic and lumbar regions
Serratus posterior superior muscle; Serratus posterior inferior muscle; Notes This page was last edited on 22 October 2020, at 23:07 (UTC). Text is ...
They supply the rectus abdominis and end as the anterior cutaneous branches of the abdomen; they supply the skin of the front of the abdomen. The lower intercostal nerves supply the intercostales and abdominal muscles; the last three send branches to the serratus posterior inferior. About the middle of their course they give off lateral ...
Oblique Superior and inferior 2 1 rectus, medial: head, eye, orbit (left/right) annulus of Zinn at orbital apex 5.5 mm medial to corneal limbus: ophthalmic artery: oculomotor nerve [CNIII], inferior branch: adducts eye: Oblique Superior and inferior 2 1 rectus, lateral: head, eye, orbit (left/right) annulus of Zinn at orbital apex 7 mm temporal ...