S 2 



PRACTICAL ANATOMY. 



Are any other arteries accompanied by sympathetic nerves, in like manner, in tins 

 region / 



Yes, branches of the sympathetic accompany every branch of the external 

 carotid artery. Hyperaemia then may occur in the distribution of the temporal, 

 internal maxillary, and lingual arteries. The specific name for this physiological 

 hypersemia on the face is " blushing." 



Relations of the Sterno-cleido-mastoid Muscle. Review now carefully 

 your dissection, and learn the relations of this muscle thus far exposed. See if 

 your work shows the following points : 



1. Did you demonstrate a sternal and clavicular origin and a mastoid and 

 occipital insertion of the muscle ? 



2. Did you find crossing or lying upon the sheath of the muscle the external 

 jugular vein, the superficial cervical nerve, the great auricular nerve, and the 



Stylo-hyoid ligament 



BODY OF HYOID BONE 

 Thyro-hyoid ligament 



Thyro-hyoid membrane 



Levator glandulse thyroidea 



THYROID CARTILAGE 



PYRAMIDAL PROCESS OF THYROID BODY 



XI LEFT LATERAL LOBE 



FIG. 27. THYROID BODY, WITH MIDDLE LOUE AND LEVATOR MUSCLE. 



'mastoid branch or second small occipital nerve ? Did you see emerging through 

 the deep fascia, between the muscle and the trapezius, in the occipital triangle, 

 the spinal accessory nerve and all the superficial branches of the cervical plexus ? 

 Did you find the sheath of the muscle attached to the clavicle below? Did you 

 find the same derived from the first layer of the deep cervical fascia and continu- 

 ous above with the masseteric and parotid fasciae ? with the stylo-maxillary liga- 

 ment? with the submaxillary and digastric fasciae ? 



Having done this, you may lift the muscle, observe its nerve-supply again, 

 from the spinal accessory and cervical plexus, and study the posterior relations. 



Posterior relations of the sterno-clcido-mastoid muscle are : 



1. The contents of the second layer of the deep cervical fascia. 



2. The carotid sheath and its contents. This latter, you will remember, 

 belongs to the third layer of deep cervical fascia. 



