. Cunningham's Text-book of anatomy. Anatomy. 444 THE MUSCULAK SYSTEM. Nerve-Supply. —Posterior rami of the spinal nerves. Actions.—These muscles are concerned in extension, lateral movement and rotation of the spine. Fourth Croup. This group includes several sets of small muscles, which are vertebro-cranial or intervertebral in their attachments. The muscles bounding the suboccipital triangle are four in number—obliqui capitis, inferior and superior, and recti capitis posteriores, major and minor. These muscles are concealed by the semispinalis capitis and splenius capitis; they enclose a tri
. Cunningham's Text-book of anatomy. Anatomy. 444 THE MUSCULAK SYSTEM. Nerve-Supply. —Posterior rami of the spinal nerves. Actions.—These muscles are concerned in extension, lateral movement and rotation of the spine. Fourth Croup. This group includes several sets of small muscles, which are vertebro-cranial or intervertebral in their attachments. The muscles bounding the suboccipital triangle are four in number—obliqui capitis, inferior and superior, and recti capitis posteriores, major and minor. These muscles are concealed by the semispinalis capitis and splenius capitis; they enclose a triangular space (the suboccipital triangle) in which the vertebral artery, the posterior ramus of the suboccipital nerve, and the posterior arch of the atlas are contained. Semispinalis capitis (insertion) Rectus capitis posterior minor (insertion) Rectus capitis posterior major (insertion) Trapezius (origin). Sterno-cleido-mastoid (insertion) Splenius capitis (insertion) Obliquus capitis superior (insertion) Rectus capitis lateralis (insertion) Rectus capitis anterior (insertion) Longus capitis (insertion) Superior constrictor of pharynx (insertion) Fig. 396.—Muscle-Attachments to the Occipital Bone. The obliquus capitis inferior arises from the spine of the epistropheus, and is inserted into the transverse process of the atlas. Nerve-Supply.—Posterior ramus of the first cervical (suboccipital) nerve. Actions.—Extension, lateral flexion and rotation of the atlas in the axis. M. Obliquus Capitis Superior.—The obliquus capitis superior arises from the transverse process of the atlas, and is inserted into the occipital bone beneath and lateral to the semispinalis capitis and above the inferior nuchal line (Fig. 396). Nerve-Supply.—Posterior ramus of the first cervical (suboccipital) nerve. Actions. —Elevation, lateral movement and rotation of the head on the atlas. M. Rectus Capitis Posterior Major.—The rectus capitis posterior major arises from the spine of the
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