es ef 
MUSCLES OF HEAD. 63 
the vertebree, and in front into the posterior end 
of the skull. The anterior part is divided by 
transverse tendinous intersections. 
viii. The intertransversales: small muscles running 
between the transverse processes of the vertebree 
and lying beneath the extensor communis. 
ix. The gluteus: arises from the outer side of the pos- 
L terior two-thirds of the ilium, and runs backwards 
to be inserted into the trochanter of the femur. 
B. Muscles of Head. 
1. Muscles of the ventral surface of the head. 
i. The mylohyoid or submandibular muscle: a flat 
sheet of muscle running across from one ramus 
of the mandible to the other, and divided down 
the middle line by a tendinous intersection. A 
narrow strip along the posterior border is 
commonly separated by a slight interval from the 
major or anterior part of the muscle. 
Remove the mylohyoid muscle, and the sternal portion of the 
pectoralis. 
ii. The geniohyoid: a narrow longitudinal band a 
short distance from the middle line : it arises from 
the lower jaw close to the chin, runs back on the 
ventral surface of the body of the hyoid, and 
divides posteriorly into two portions which are 
inserted respectively into the bony and the car- 
tilaginous posterior processes of the hyoid. 
iii. The sternohyoid : is practically the anterior con- 
tinuation of the rectus abdominis. It arises from 
the dorsal surface of the coracoid and clavicle, 
and is inserted into the ventral surface of the 
body of the hyoid, the tendon passing between 
the two divisions of the geniohyoid. 
iv. The hyoglossus: arises on either side from the 
posterior bony horn of the hyoid: the two muscles 
converge and meet each other in front of the 
larynx. In front of the larynx the muscle runs 
