544 



BLOOD-VASCULAR SYSTEM OF THE HORSE 



THE OCCIPITAL ARTERY 



The occipital artery (A. occipitalis) is the second in size of the terminals of 

 the carotid. It arisesusually just in front of the internal carotid, but in some cases 



Fig. 43.3. — Deep Dissection of Neck op Horse. 

 o, a. Ends of sterno-cephalicus; b, anterior part of omo-hyoideus; c, sterno-thyro-hyoideus; d, trachea; 

 e, oesophaKUs; /, cariniform cartilage; o, rectus cap. ant. major; h, stump of trachelo-mastoideus; i, intertrans- 

 versales; k, niultifidus; I, m, scalenus; n, serratus cervicis; o, o, stumps of splenius, p, longissimus, q, complexus 

 (most of which is removed) ; r, rhomboideus; s, trapezius; <, spinalis et semispinalis; ?/, lamellar part of lig. nuchje; 

 1', mastoido-humeralis; w, anterior deep pectoral; x, supraspinatus; y, anterior superficial pectoral; z, scapular 

 tuberosity; /, /, articular processes of cervical vertebra^; 2, 2, transverse proces.ses of same; S, atlas; S', axis; 

 4, 4, jugular vein (remainder removed); S, common carotid artery, from which a piece is removed to show the ac- 

 companying nerves; 6, vago-symiiathetic trunk; 7, 7, tracheal and muscular branches of carotid artery; S, re- 

 current nerve; 10, left tracheal lymph-duct; 11, 12, ascending and descending branches of inferior cervical artery 

 {IS); 14, cephalic vein; 15-20, ventral branches of second to seventh cervical nerves; 21 , roots of phrenic nerve; 

 22, thoracic or pectoral nerves; 22' , nerve to serratus magnus; 23, musculo-cutaneous nerve; 24, median nerve; 

 26, ulnar nerve; 26, radial nerve; 27, axillary nerve; 28, dorsal branches of cervical nerves; 2S' , accessory nerve 

 (cut); 29, superior or deep cervical artery; SO, muscular branch of vertebral artery; 31, posterior (anastomotic) 

 branch of occipital artery; 32, vertebral artery; S3, muscular branches of occipital artery; 34, obliquus capitis 

 post.; 35, obi. cap. ant.; 3G, twig from dorsal branch of third cervical nerve. (After Ellenberger-Baum, Top. 

 Anat. des Pferdes.) 



with that artery by a common trunk of variable length. It pursues a somewhat 

 flexuous course to the fossa atlantis, where it divides into anterior and posterior 

 branches. It is related superficially to the submaxillary gland and the mastoido- 

 humeralis, and deeply to the guttural pouch and the rectus capitis anterior 



