THE MUSCLES OF THE HYOID BONE. 385 
_ passes upwards and slightly outwards in the neck in front of the trachea and 
thyroid body, and beneath the omo-hyoid and sterno-hyoid muscles, to be inserted 
into the oblique line of the thyroid cartilage. The muscle is marked by an oblique 
tendinous intersection in the middle of its length. 
The thyro-hyoid muscle continues the line of the preceding muscle to the hyoid 
bone. Short and quadrilateral, it arises from the oblique line of the thyroid 
STERNO-CLEIDO-__ 
MASTOID = 
(KS Wi) 
CoMPLEXUS—— Wass ay 
NS 
7 MyLo-HyoIp 
SPLENIUS CAPITIS DIGASTRIC 
: ' 
— Hyoauossus 
S’YLO-HYOID 
LEVATOR ANGULI__ 
SCAPULA: 
~~ MIDDLE CONSTRICTOR 
THYRO-HYOID 
INFERIOR 
SCALENUS MEDIUS ——___ 
CONSTRICTOR 
OMO-HYOID 
SCALENUS ANTICUS INFERIOR 
/ CONSTRICTOR 
Omo-HYOID G)/}i//) | SIuENO-S OK. 
Vy J | —_ wate 57) eer 
PRES PLN ~~ 7 STERNO-THYROID 
It Py (en 2 
Fic, 284.—THE TRIANGLES OF THE NECK (Muscles). 
cartilage, and passing over the thyro-hyoid membrane beneath the omo-hyoid and 
sterno-hyoid, it is inserted into the body of the hyoid bone. 
The levator glandule thyroidee is an occasional slip stretching between the hyoid bone 
and the isthmus or pyramid of the thyroid body. 
The supra-hyoid muscles comprise the digastric, stylo-hyoid, mylo-hyoid, 
genio-hyoid muscles, and also the genio-hyoglossus and hyoglossus, to be described 
among the extrinsic muscles of the tongue. 
The digastric muscle arises by its posterior belly from the digastric groove 
beneath the mastoid process. It is directed downwards and forwards to end in an 
intermediate tendon, which is connected by a pulley-lke band of cervical fascia 
to the body of the hyoid bone. The anterior belly of the muscle is directed 
forwards and upwards to the chin, and is inserted into an oval impression on the 
lower border of the mandible close to the symphysis. The muscle forms the 
25 
a 
4 
7" és 
