82 ANATOMY OF THE DOMESTIC FOWL 



4 



Action. Extends the head. 



Flexor Capitis Inferior (Fig. 19, No. 7). Location. Antero- 

 inferior part of the neck. 



Origin. From the apices of the hyapophyses of the second, the 

 third, and the fourth cervical vertebrae. 



Insertion. To the triangular area on the basi-temporal of the 

 base of the cranium. 



Shape. At first tendinous, becomes somewhat fleshy as it passes 

 forward. 



FIG. 19. Muscles of the head and neck, i, Masseter muscle. 2, Infra- 

 orbital sinus. 3, Biventer maxilla. 4, Temporalis. 5, Complexus. 6, Rectus 

 capitis posticus major. 7, Flexor capitis inferior. 8, Rectus capitis anticus 

 minor. 9, Biventer cervicis. 10, Longus colli posticus. II, Obliquus colli. 12, 

 Intertransversales. 13, Longus colli anterior. 14, Lateral temporo-maxillary 

 ligament. 15, Lateral ligament of the jaw. 16, Trachelo-mastoideus. 17, 

 Rectus capitis lateralis. 18, Scalenus medius. 19, Rhomboideus. 20, Tra- 

 pezius. 21, Location of scapula. 22, Supraspinatus. 23, Teres et Infraspinatus. 



Relations. Antero-inferior portion of the neck close to the rectus 

 capitis anticus minor. 



Action. Flexes the head upon the neck. 



Rectus Capitis Posticus Major (Fig. 19, No. 6). (Synonym. 

 Rectus capitis dorsalis major.) 



Location. Supero-lateral area on the anterior portion of the 

 neck. 



Origin. From the median anterior aspect of the second cervical 

 vertebra, and the supero-anterior border of the neural canal. 



