Axial CT of the Head         (Return to List of Available Self-Test Images - Normal Structure)
This is a contiguous series of CT slices of the head in a 22y old man. Intravascular contrast has been administered to the patient. You can look at the video frame by frame and try to identify the labelled structures. Sometimes a structure is labelled in only one of the sections in which it can be seen; in other cases the same structure may be labelled in a few sections, not necessarily contiguous. The answers will be revealed when you click on the appropriately labelled drop-down arrows below the image.

	A =                                             external carotid a.	B =                                             internal carotid a.	C =                                             IJV
	D =                                             masseter	E =                                             medial pterygoid	F =                                             temporalis
	G =                                             lateral pterygoid	H =                                             styloid process	I =                                             lateral pterygoid plate
	J =                                             maxillary air sinus	K =                                             parotid gland	L =                                             dens of axis
	M =                                             vertebral a.	N =                                             coronoid process of mandible	O =                                             mandibular condyle
	P =                                             external auditory meatus	Q =                                             sigmoid sinus	R =                                             internal carotid a.
	S = be specific                        jugular bulb	T =                                             mastoid air cells	U =                                             basilar a.
	V =                                             medial rectus	W =                                             lateral rectus	X =                                             ophtalmic a. (this is a case when the artery passes inferior to the optic n.)
	Y =                                             internal carotid a.	Z =                                             optic n.	1 =                                             superior ophthalmic v.
	2 =                                             superior rectus	3 =                                             anterior cerebral a.	4 =                                             middle cerebral a.
	5 =                                             superior sagittal sinus	6 =                                             posterior cerebral a.