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1 Cranial bones. Ossa cranii. Bones of the skull.

1a Neurocranium. Portion of the cranium that encloses the brain.

Viscerocranium. Portion of the cranium that forms the face.

Chondrocranium. Cartilaginous part of embryo-logical skull that later forms base of skull.

2 Occipital bone. Os occipitale. It lies between the sphenoid, temporal and parietal bones. ABC

3 Foramen magnum. Large opening in the occipital bone for passage of the medulla oblongata, vessels and nerves. A B C

4 Basion. Midpoint of the anterior border of the foramen magnum. B

5 Opisthion. Midpoint of the posterior border of the foramen magnum. A B

6 Basilar part of occipital bone (basioccipital bone). Pars basilaris ossis occipitalis. Portion of occipital bone that projects superiorly from foramen magnum to sphenoid bone. AC

6 a Clivus. Part of the basioccipital bone that slopes upwardly from the foramen magnum to the dor-sum sellae. B

7 Groove for inferior petrosal sinus of occipital bone. Sulcus sinus pertrosi inferioris ossis occipi-talis. A

8 Pharyngeal tubercle. Tuberculum pharyngeum. Prominence on the inferior surface of the basioccipital bone, for attachment of the pharyn-geal raphe. A C

9 Lateral (condylar) part of occipital bone. Pars lateralis ossis occipitalis. It lies lateral to the foramen magnum. A B

10 Squamous part of occipital bone. Squama occipitalis. Area extending from the posterior edge of the foramen magnum. ABC

11 Mastoid margin. Margo mastoideus. The border of the occipital bone united with the temporal bone. A

12 Lambdoid margin. Margo lambdoideus. The border of the occipital bone that articulates with the parietal bone. A

13 Interparietal bone. [Os interparietal]. Anatomic variant that forms when the upper half of the squama occipitalis is separated by a transverse suture.

14 Occipital condyle. Condylus occipitalis. Process on the occipital bone, for articulation with the atlas. A B C

15 Condylar canal. Canalis condylaris. Passage located posterior to the occipital condyle, for transmission of a vein from the sigmoid sinus. A B C

16 Hypoglossal canal. Canalis hypoglossalis. Passage that originates from the lateral part of the occipital bone anterior to the foramen magnum and ends outside, anterior to the occipital con-dyle. It transmits the twelfth cranial nerve and the venous plexus. A B C

17 Condylar fossa. Fossa condylaris. Depression posterior to the occipital condyle. B

18 Jugular tubercle. Tuberculum jugulare. Small eminence above the hypoglossal canal. A B C

19 Jugular notch. Incisura jugularis. Indentation for the jugular foramen. A C

20 Jugular process. Processus jugularis. Externally and internally visible process that projects laterally from the jugular foramen. It corresponds to the transverse process of a vertebra. A C

21 Intrajugular process of occipital bone. Processus intrajugularis ossis occipitales. It occasionally divides the jugular foramen into a lateral portion for the internal jugular vein and a medial segment for nerves. C

22 External occipital protuberance. Protuberentia occipitalis externa. Readily palpable bony projection in the middle of the occipital bone. B

23 Inion. Anthropometric landmark indicating the most prominent point on the external occipital protuberance. B

24 External occipital crest. Crista occipitalis externa. Bony ridge occasionally present between the external occipital protuberance and the foramen magnum. B

25 Highest (supreme) nuchal line. Linea nuchalis suprema. Line arching externally from the upper margin of the external occipital protuberance. It gives attachment to the occipital belly of the epicranius muscle. B

26 Superior nuchal line. Linea nuchalis superior. Transverse ridge at the level of the external occipital protuberance. The trapezius muscle attaches between it and the highest nuchal line. B

27 Inferior nuchal line. Linea nuchalis inferior. Transverse ridge between the superior nuchal line and the foramen magnum. The semispinalis capitis muscle attaches between it and the superior nuchal line. B

27 a Occipital plane. Planum occipitale. Outer surface of the occipital bone located superior to the external occipital protuberance. B C

28 Cruciform eminence. Eminentia cruciformis. Cross-shaped bony prominence with the internal occipital protuberance at its center. A

29 Internal occipital protuberance. Protuberantia occipitalis internal. Midpoint of the cruciform eminence. A

30 Internal occipital crest. [Crista occipitalis interna]. Thick bony ridge that occasionally extends from the internal occipital protuberance to the foramen magnum. A

31 Groove for superior sagittal sinus. Sulcus sinus sagittalis superioris. A

32 Groove for transverse sinus. Sulcus sinus trans-versi. A

33 Groove for the sigmoid sinus. Sulcus sinus sig-moidei. Groove that begins before the sigmoid sinus enters the jugular foramen. A C

33 a Groove for occipital sinus. Sulcus sinus occipi-

talis. A

34 Paramastoid process. [Processus paramas-toideus]. Prominence that occasionally projects from the jugular process in the direction of the transverse process of the atlas.

34 a Cerebral fossa. Fossa cerebralis. Depression for the occipital lobes of the cerebrum. A

34 b Cerebellar fossa. Fossa cerebellaris. Depression for the cerebellum. A

11 Sphenoid bone. Os sphenoidale. Bone located between the frontal, occipital and temporal bones. ABC

2 Body of sphenoid bone. Corpus ossis sphe-noidalis. Part located between the winged processes of the sphenoid bone. A B

3 Jugum sphenoidale. Connects the lesser wings of the sphenoid. A

4 (Pre)chiasmatic groove. Sulcus prechiasmati-cus. Groove between the right and left optic canals. A

5 Turkish saddle. Sella turcica. It lies above the sphenoidal sinus and contains the hypophysis. A

6 Tuberculum sellae. Small process in front of the hypophysial fossa. A

7 Middleclinoidprocess. [Processusclinoideus medius]. Either of two small protuberances occasionally present, one on either side of the floor of the hypophysial fossa. A

8 Hypophysial fossa. Fossa hypophysialis. Fossa occupied by the hypophysis. A

9 Dorsum sellae. Posterior wall of the hypophysial fossa. A C

10 Posterior clinoid process. Processus clinoideus posterior. Either of two processes that extend from either side of the dorsum sellae. A C

11 Carotid groove. Sulcus caroticus. Longitudinal groove lateral to the body of the sphenoid bone that lodges the internal carotid artery. A

12 Lingula sphenoidalis. Pointed process lateral to the entrance of the internal carotid artery into the cranial fossa. A

13 Sphenoidal crest. Crista sphenoidalis. Median bony ridge on the anterior surface of the body of the sphenoid bone that articulates with the perpendicular plate of the ethmoid. C

14 Sphenoidal rostrum. Rostrum sphenoidale. Downward continuation of the sphenoidal crest that articulates with the vomer. C

15 Sphenoidal sinus. Sinus sphenoidalis. Eitherof the paired paranasal sphenoidal sinuses. C

16 Septum of sphenoidal sinus. Septumintersinuale sphenoidale. Partition separating the sinus into right and left parts. C

17 Aperture of sphenoidal sinus. Apertura sinus sphenoidalis. Orifice that opens anteriorly into the spheno-ethmoidal recess. C

18 Sphenoidal concha. Concha sphenoidalis. Originally paired, concave bony plate which fuses with the body of the sphenoid and forms part of the anterior and inferior wall of the sphe-noidal sinus and other structures. C

19 Lesser wing of sphenoid. Ala minor ossis sphe-noidalis. AB C

20 Optic canal. Canalis opticus. Canal for the optic nerve and the ophthalmic artery. A

21 Anterior clinoid process. Processus clinoideus anterior. Cone-like process on either side of the anterior part of the hypophysial fossa. A

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