Bassett Collection of Stereoscopic Images of Human Anatomy

Dissection of left infratemporal and pterygopalatine fossae

Nerve supply to internal pterygoid muscle; mandibular division of trigeminal nerve, lateral view

Image #66-1

KEYWORDS: Cheek, Face, Mouth, Muscles and tendons, Peripheral nervous system.

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Higher resolution images are available for a fee. Contact Drew Bourn, PhD, MLIS.

Dissection of left infratemporal and pterygopalatine fossae
Nerve supply to internal pterygoid muscle; mandibular division of trigeminal nerve, lateral view
In an earlier dissection (65-6) a small branch appeared which passed from the lingual nerve into the internal pterygoid muscle. The major nerve supply (10) to this muscle has now been exposed. Bone has been cut away to show the semilunar ganglion and the mandibular nerve as it passes through the foramen ovale (13).
1 . Maxillary nerve (V) passing through foramen rotundum
2 . Infraorbital artery
3 . Mucosa of sphenoid sinus exposed by grinding away sphenoid bone
4 . Pterygopalatine fossa (pointer indicates general area of fossa)
5 . Superior posterior alveolar artery
6 . Buccinator nerve
7 . Posterior deep temporal nerve (the anterior deep temporal nerve leaves the buccinator nerve slightly to the left of the pointer but is displaced downward and not clearly visible)
8 . Lateral plate of pterygoid process (partially resected)
9 . Remnant of origin of external pterygoid muscle
10 . Internal pterygoid nerve
11 . Internal pterygoid muscle
12 . Buccal mucosa (cross section)
13 . Upper pointer: Semilunar ganglion (trigeminal) Lower pointer: Mandibular nerve in foramen ovale
14 . Petrotympanic fissure
15 . Middle meningeal artery (foramen spinosum cut open at upper pointer)
16 . Auriculotemporal nerve
17 . Masseteric nerve
18 . Styloid process
19 . Tensor veli palatini muscle
20 . Facial nerve (VII)
21 . Upper pointer: Inferior alveolar nerve Lower pointer: Lingual nerve
22 . External carotid artery
23 . Remnant of sympathetic plexus on external carotid artery
24 . Posterior belly of digastric muscle
25 . Upper pointer: Styloglossus muscle Lower pointer: Stylomandibular ligament
26 . Stylohyoid muscle
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