. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 27: masseter, which raises the mandible; the temporalis, which raises the mandible and draws it back. The chief function of the pterygoids, internal and external, is in moving the jaw from side to side, as in chewing. The digastric lowers the jaw. Some of the tongue muscles are intrinsic but most are extrinsic. The intrinsic lingualis forms an interwoven complex extending longitudinally, vertically, and transversely. Of the extrinsic group, the hyoglossus and styloglossus retract the tongue, while the genioglossus, which forms mo
. Comparative anatomy. Anatomy, Comparative. THE MUSCULAR SYSTEM 27: masseter, which raises the mandible; the temporalis, which raises the mandible and draws it back. The chief function of the pterygoids, internal and external, is in moving the jaw from side to side, as in chewing. The digastric lowers the jaw. Some of the tongue muscles are intrinsic but most are extrinsic. The intrinsic lingualis forms an interwoven complex extending longitudinally, vertically, and transversely. Of the extrinsic group, the hyoglossus and styloglossus retract the tongue, while the genioglossus, which forms most SPLENIUS- SEMISPINALIS CAPITIS. LEVATOR SCAPULAE- SCALENUS MEDIUS SCALENUS ANTERIOR- LONGUS CAPITIS ESOPHAGUS ARYTENOIDEUS TRANSVERSU THYREOARYTENOID TRANSVERSUS r-SPINALIS. LONGISSIMUS CAPITIS. LONGISSIMUS CONSTRICTOR PHARYNGIS INFERIOR. â STERNOCLEIDO- MASTOID. PLATYSMA- STERNOHYOID MOHYOID. STERNOTHYROID- â THVREOHYOID- ICAVITY OF LARYNX . Fig. 229.âHuman neck muscles in cross section. Muscles stippled and skeletal elements cross-hatched. (Redrawn after Morris modified.) of, the body of the tongue, both extends and retracts it, depending upon which part of the muscle contracts. Another group of muscles lies in the floor of the throat between the mandibles and thehyoid bone, among them the anterior belly of the digas- tric, the geniohyoid, and the mylohyoid. The stylohyoid and the posterior belly of the digastric extend from the hyoid to the styloid process. Food is forced into the esophagus by a group of constrictor muscles of the pharynx. Muscles of the Neck. In addition to the cutaneous platysma, the neck contains sixteen paired muscles. Underneath the platysma on the side of the neck, the conspicuous stemocleido-mastoid bends and rotates the head. The trapezius, strictly a muscle of the shoulder, extends well up on the back of the neck. Another shoulder muscle, the levator scapulae, draws the shoulder blade towards the head. (Fig. 229.). Please note that t
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
