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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 1.18

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 1.18

Upper Left Quadrant

Lower Left Quadrant

Lower Right Quadrant

Upper Right Quadrant

1. Sphenoid sinus
2. Superior tarsus
3. Internal carotid a.
4. Temporalis m.
5. Temporal bone, zygomatic process
6. Mandibular condylar process, temporomandibular articulation

7. Basilar a.
8. Auricle
9. Mastoid air cells
10. Vertebral a.
11. Medullary pyramid
12. Medullary olive

13. Internal occipital crest
14. Fourth ventricle
15. Corpus medullare of cerebellum
16. Ventral cochlear nucleus
17. Abducens nerve
18. Bony labyrinth, semicircular canal
19. Vestibulocochlear nerve

20. Facial nerve
21. Internal auditory meatus
22. Temporal lobe
23. Trigeminal nerve and ganglion
24. Internal carotid a.
25. Lateral rectus m.
26. Medial rectus m.
27. Basiocciput (clivus)
28. Nasal conchae

This is a section through the temporal lobe (22), cerebellum (15), and medulla oblongata (11, 12). Between the medulla oblongata(11, 12) and cerebellum (15) is the fourth ventricle (14). Within the medulla oblongata, the medullary pyramids (11) are ventrally placed and the medullary olives (12) are dorsal to the pyramids (11). Ventral to the medullary pyramids (11) is the abducens nerve (17), which exits the brain stem at the medulla pons junction. The ventral cochlear nucleus (16) is seen in a dorsolateral position in the medulla. The vestibulocochlear nerve ( 19) enters the medullary pontine junction dorsolaterally. The facial nerve (20) travels in close proximity to the vestibulocochlear nerve (19). Both are seen entering the internal auditory meatus (21). Ventral to the medullary pyramids (11) is the basilar artery (7) lying on the basiocciput (clivus) (27). The vertebral artery (10) is lateral to the medulla. The white matter core of the cerebellum is the corpus medullare of the cerebellum (15). Rostrally in the section are seen the nasal conchae (28). Caudal to the nasal cavity is the spheroid sinus (1). Within the orbital cavity two extraocular muscles are seen: the medial (26) and lateral (25) rectus muscles. The superior tarsus (2) is seen. The temporal lobe (22) is in the middle cranial fossa. Medial to the middle cranial fossa are the trigeminal nerve and ganglion (23) and the internal carotid artery (3, 24). Caudal to the middle cranial fossa is the mandibular condylar process (6). Other structures seen in this section are the semicircular canals in the temporal bone (18), the internal occipital crest (13), mastoid air cells (9), the auricle (8), the zygomatic process of the temporal bone (5), and the temporalis muscle (4).

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