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Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 1. Head and Neck

Atlas of Human Anatomy in Cross Section: Section 1. Head and Neck

Plate 1.22

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

Plate 1.22

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Brain, frontal lobe in anterior cranial fossa
2. Frontal sinus
3. Sphenoid sinus
4. Medial rectus m.
5. Orbital fat
6. Internal carotid a.
7. Tendon m. temporalis
8. Temporal bone
9. Mandible, condyloid process
10. Basilar a.

11. External auditory meatus
12. Pinna
13. Sigmoid sinus
14. Tendon m. sternocleidomastoid
15. Rectus capitis lateralis m.
16. Splenius capitis m.
17. Semispinalis capitis m.
18. Rectus capitis posterior major m.
19. Rectus capitis posterior minor m.
20. Medulla oblongata
21. Foramen magnum
22. Trapezius m.
23. Ligamentum nuchae

24. Cerebellar tonsil
25. Occipital bone
26. Posterior cranial fossa
27. Cerebellar hemisphere
28. Splenius capitis m.
29. Sigmoid sinus
30. Internal jugular v.
31. Mastoid air cells

32. Middle cranial fossa
33. Temporal lobe
34. Sphenoid bone, greater wing
35. Lateral rectus m.
36. Sclera, eye
37. Optic nerve
38. Posterior ethmoid sinus
39. Anterior ethmoid sinus
40. Crista galli

This is a section through the base of the cranial cavity. Rostrally in the midline is the crista galli (40). On one side of the crista galli (40) are the anterior (39) and posterior (38) ethmoid sinuses, and on the other is a frontal lobe (1) gyrus. Rostral to the anterior cranial fossa (1) is the frontal air sinus (2), and caudal to the posterior ethmoid sinus (38) is the spheroid sinus (3). Within the orbital cavity are the medial (4) and lateral (35) rectus muscles, orbital fat (5), the sclera (36), and optic nerve (37). Lateral and caudal to the orbital cavity is the greater wing of the spheroid bone (34). The temporal lobe (33) is seen in the middle cranial fossa (32). Within the posterior cranial fossa (26) are the hemispheres (27) and tonsils (24) of the cerebellum, the medulla oblongata (20) and the basilar artery (10). The tonsils of the cerebellum (24) and the medulla oblongata (20) are visualized through the foramen magnum (21) in the occipital bone (25). Major vascular structures seen in this section include the internal carotid artery (6), internal jugular vein (30), and the sigmoid sinus (13, 29). Lateral to the internal jugular vein (30) are the mastoid air cells (31). Bony landmarks in this section include the occipital (25) and temporal (8) bones, the greater wing of the sphenoid bone (34), and the condyloid process of the mandible (9). The pinna (12) and external auditory meatus (11) are seen. Outside the cranial cavity, the following muscles, tendons, and ligaments are seen: splenius capitis (28), trapezius (22), rectus capitis posterior minor (19) and major (18), semispinalis capitis (17), splenius capitis (16), rectus capitis lateralis (15), sternocleidomastoid tendon (14), ligamentum nuchae (23), and temporalis tendon (7).

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