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180 ANATOMY
The Temporal Muscle (Fig. 92) is a radiating or fan-shaped muscle
situated in the temporal fossa and descending to the coronoid process of
the inferior maxillary bone. It is composed of a superficial and a deep
portion.
The Superficial Portion is thin and delicate, arising from the temporal
its fibres are continuous above with those of the
fossa or aponeurosis ;
Fig. 92.

The Temporal Muscle, the zygoma and masseter having been removed.
deep portion, but are gradually lost below in the deep layer of the mas-
seter muscle.
The Deep Portion is thick and powerful ; its anterior fibres are
almost vertical, while those behind pass obliquely forward. The mus-
cle arises by fleshy fibres from all the surface of the temporal fossa
except the anterior or that portion known as the orbital septum. The
fibres gradnally converge as they descend to form a central tendon,
which is inserted chiefly into the inner surfiice of the coronoid process
of the lower ja^v.
Relations.—Its superficial surface is covered by the temporal fascia
;
the lower and anterior part is imbedded in fat which is a continuation
of that which lies between the mnsseter and buccinator muscles. The
upper part of its deep surface rests upon the bone ; the deej) temporal
arteries and nerves which supply tlie muscle pass between the nuiscle
and the bone ; in its lower })ortion it is in relation with the external
pterygoid and })art of the buccinator, the internal maxillary artery, and
temporal nerves.
Arteries.—It is sn])])li('d by the superficial temporal branches of the
external carotid and the deci) temporal arteries, branches of the internal
maxiliarv.