5] i AXATOMY IX A NUTSHELL. 



Corrugator supercilii, and Orbicularis palpebrarum muscles. A few fibers of this 

 muscle may be attached to the nasal hone and the frontal bone. 



Ixsi i; i [ON. Into the tendinous aponeurosis of the vertex of the skull. 



ACTION.— The frontal portion draws the scalp forward and raises the eye 

 brows and skin over the root of the nose. The occipital portion draws the scalp 

 backward. The Occipito-frontalis muscle is chiefly a muscle of facial ex- 



-!OH. 



\ i i;\ i; Supply.— The frontal portion receives the facial nerve or branches 

 of the third nerve which join this nerve. The occipital portion receives the pos- 

 terior auricular branch of the facial and sometimes the occipitalis minor. 



Blood Supply. -The frontal portion receives the supraorbital, frontal, 

 and anterior temporal arteries. The occipital portion receives the occipital 

 and posterior auricular arteries. 



Trapezius muscle. For description of this muscle see page 4."). 



Sterno-cleido-mastoid. For description of this muscle see page 40. 



Complexus. For description of this muscle see page 27."). 



Splenius capitis. For description of this muscle see page 272. 



Superior oblique. For description of this muscle see page 278. 



Rectus capitis posticus major. For description of this muscle see page 278. 



Rectus capitis posticus minor. For description of this muscle see page 278. 



Rectus capitis lateralis. — Description. — This muscle belongs to the an- 

 terior vertebral region. 



Origin.— From the upper surface of the transverse process of the atlas. 



Insertion. — Into the under surface of the jugular process of the occipital 

 bone. 



A<tio\. — To draw the head laterally. 



\i.i;\ i Si pply. First cervical nerve and a loop between it and the second. 



Blood Supply. Prevertebral branches of ascending pharyngeal artery. 



Rectus capitis anticus major. — DESCRIPTION. — This muscle belongs to the 

 anterior vertebral region, and looks as though it were a continuation upward 

 of the Scalenus anticus. It is narrow below hut broad and thin above. Be- 



hind it are the Longus colli and Rectus capitis anticus minor muscles. In front 

 of it is the sympal hei ic nerve. 



Origin.— From the anterior tubercles of the transverse processes of the 

 third, fourth, fifth, and sixth cervical vertebrae. As it passes upward it con- 

 verges towards ii> fellow. 



INSERTION. Into the basilar process of the occipital bone. 



ACTION. To flex and rotate the head, and to restore it to its natural posi- 

 tion after being drawn backward. 



Nerve Si pply. Firsl cervical and a loop between it and the second cer- 

 vical nerve. 



Blood Supply. Prevertebral branches of ascending pharyngeal. 



Rectus capitis anticus minor. DESCRIPTION. — This muscle, which is short, 

 lies immediately behind the Rectus capitis anticus major and in front of the 

 occipito-atlantal articulation. Its course is obliquely upward and inward. 



