OCR Text |
Show 480 DR. A. MACALISTER O N GLOBIOCEPHALUS SVINEVAL. [May 9, broad palato-pharyngeus muscle, which arose from the posterior border of the palate bones opposite the median line of the velum and above and behind the palato-glossus; from this point the muscles of both sides diverged, and, passing beneath or on the inner aspect of the superior constrictor, were inserted into the vertebral edge of the thyroid cartilage. There was no trace of a tonsil; nor anteriorly could any rudiment of a salivary gland be found, even though I searched in the locality corresponding to the place where Dr. Carte and I found a rudimental parotid in Balcenoptera rostrata. In the dissection of the neck I found the following muscles connected with the hyoid bone and larynx : - 1 . Sterno-hyoid, arose from the upper edge of the sternum and ran to the body of the hyoid bone. 2. Sterno-thyroid, from the back of the sternal extremity of the cartilage of the first rib to an angular line on the thyroid cartilage; in direction it ran upwards and inwards, and it overlapped the common carotid artery. This muscle was not found by Dr. Carte and myself in Balcenoptera; its costal origin is interesting, as a corresponding attachment is sometimes its sole origin in Man, as described by Hallett and others. 3. Thyro-hyoid, from above the oblique line on the ala of the thyroid cartilage to the posterior border of the base of the os hyoides. 4. Crico-thyroid, quadrilateral in shape, entirely covered by the sterno-thyroid, passed from the front of the cricoid cartilage upwards and forwards* to the posterior edge of the thyroid- 5. Hyo-keratic (/ceoas, cornu), probably a modified hyo-glossus, arose from the anterior edge of the body of the hyoid bone, and was inserted into the hinder and upper edge9 of the stylo-hyoid cornu; this muscle was short, broad, and thick. 6. Stylo-keratic, arose from the squamous bones, external to the articulation between the stylo-hyoid cornu and the base of the skull; from this point it ran downwards and backwards to be inserted into the upper third of the stylo-hyoidean cornu. 7. Stylo-hyoid, a pyriform muscle remote from the last named, arose from the squamous bone internal to the afore-mentioned articulation, and was inserted into the posterior or great cornu of the hyoid bone ; its origin was placed on a plane in front of the next muscle, stylo-pharyngeus ; its belly crossed over the stylo-hyoid bone, and its tendinous insertion crossed the external carotid artery and the lingual nerve. 8. Stylo-pharyngeus, arose from that portion of the squamous bone behind the styloid articulation, posterior to the last described, and was inserted into the superior edge of the thyroid cartilage, upon which there was an oblique ridge for its insertion. This muscle was narrow at its origin, and overlapped in its course the glossopharyngeal nerve, internal and external carotid arteries, aud the rete mirabile formed by the former vessel; its insertion was superficial to the middle constrictor of the pharynx, and was separated from the attachment of the sterno-thyroid by a small part of the origin of the thyro-hyoid muscle. For these muscles I have preserved the name stylo, although they have in reality no true styloid attachment. 9. Basio-thyro-hyoid, arose * All these positions have reference to the animal as placed resting on its ventral aspect. |