THE EXTERNAL CAROTID ARTERY 645 
upward under cover of the parotid gland, to which it gives branches, and divides 
into several branches which supply the skin and muscles of the external ear (Fig. 
560). The posterior branch passes to the posterior part of the base of the ear, 
where it divides into two branches; of these, one (Ramus intermedius) passes up the 
convex surface of the external ear to the apex, while the other (Ramus medialis) 
winds around to the anterior (medial) border, and forms an arch with the inter- 
Fic. 562.—Derrp Dissection oF Heap or Horse. 
The left ramus of the mandible and structures connected with it have been removed. a, a, Stumps of styloglossus; 
b, genio-glossus; ¢, genio-hyoideus; d, omo-hyoideus; e, kerato-hyoideus; /, thyro-hyoideus; g, thyro-pharyngeus; 
h, erico-thyroideus; i, sterno-thyroideus; *, thyroid gland; m, crico-pharyngeus; n, palatinus and palato-pharyngeus; 
o, pterygoideus lateralis; p, tensor palati; g, levator palati; r, temporalis; s, rectus cap. ventralis major; ¢, obliquus 
cap. ant.; u, guttural pouch; 2, great cornu of hyoid bone, extremity of which is removed and indicated by dotted line; 
w, position of small cornu, dotted line; z, thyroid cornu; y, tongue; 2, anterior pillar of soft palate; 
poral nerve; 2, chorda tympani; 3, stump of inferior alveolar nerve; 4, 4, lingual nerve, intermediate part removed; 5, 
deep temporal nerve; 6, masseteric nerve; 7, buccinator nerve; 8, great palatine nerve; 9, infraorbital nerve; 10, 
sphenopalatine and posterior nasal nerves; 11, spinal accessory nerve; 12, vagus; 13, pharyngeal branch of vagus; 
, superficial tem- 
14, anterior laryngeal nerve; 15, vago-sympathetic trunk; 16, sympathetic, with anterior cervical ganglion a little fur- 
ther back; 17, glosso-pharyngeal nerve; 18, pharyngeal and 19, lingual, branches of glosso-pharyngeal; 20, hypoglossal 
nerve; 21, left recurrent nerve; 22, common carotid artery; 23, parotid branch; 24, anterior thyroid or thyro-laryngeal 
artery; 24’, laryngeal artery; 25, occipital artery; 26, internal carotid artery; 27, external carotid artery; 28, 30, ex- 
ternal maxillary artery; 29, pharyngeal artery; 31, lingual artery; 32, external carotid artery; 
33, stump of inferior 
alveolar artery; 34, middle meningeal artery; 35, deep temporal artery; 36, buccinator artery; 37 
88, end of internal maxillary arter 
, palatine artery; 
39, right external maxillary artery; 40. 
ellite vein of 39; 41, right parotid duct; 
42, mandibular lymph glands; 43, parapharyngeal lymph glands; 44, trachea; 45, wing of atlas; 46, dotted line indi- 
eating outline of mandibular gland; 47, lacrimal gland. (After Ellenberger-Baum, Top. Anat. d. Pferdes.) 
mediate branch. The lateral branch (Ramus lateralis) passes up the posterior 
(lateral) border of the ear and forms an arch with the intermediate branch. The 
deep branch (A. auricularis profunda) enters the interval between the external 
acoustic process and mastoid process, and passes through an opening into the 
interior of the external ear and ramifies in the skin which lines it. It gives off the 
stylomastoid artery, which passes through the stylomastoid foramen into the tym- 
