Corpus Trapezoideum Pons

Sulcus Lateralis Anterior

1 Motor nucleus of trigeminal nerve. Nucleus motorius nervi trigeminalis [nucleus motorius trigeminalis]. It is located near the exit of the trigeminal nerve. A B

2 Nucleus of abducens nerve. Nucleus nervi ab-ducentis [nucleus abducens]. It is found beneath the facial colliculus. A B

3 Nucleus of facial nerve. Nucleus nervi facialis [nucleus facialis]. This motor nucleus lies laterally below the nucleus of the abducens. A B

4 Genu of facial nerve. Genu nervi facialis. Arch formed by fibers of facial nerve below the facial colliculus and above the nucleus of the abdu-cens. B

5 Superior salivary (salivatory) nucleus. Nucleus salivarius superior. Autonomic nucleus for the parasympathetic fibers of the facial nerve. It supplies preganglionic fibers for the pterygopalatine and submandibular ganglia. A B

6 Lacrimal nucleus. Nucleus lacrimalis. Auton-omic cells lying beside the superior salivary nucleus for the control of lacrimal secretion. A B

7 Superior olivary nucleus. Nucleus olivaris su-perioris. It lies lateral to the trapezoid body, contains fibers from the cochlear nuclei and integrates hearing via the olivocochlear tract. D

8 Olivocochlear tract. Tractus olivocochlearis. Tract from the superior olivary nucleus to the hair cells of the ear.

9 Vestibular nuclei. Nuclei vestibulares. Four terminal nuclei of the vestibular division with projections to the spinal cord, cerebellum and medial longitudinal fasciculus. A B

10 Medial vestibular nucleus. Nucleus vestibu-laris medialis. Nucleus of nerve cells that lies lateral to the sulcus limitans and gives attachment to the medial longitudinal fasciculus of both sides. A D

11 Lateral vestibular nucleus. Nucleus vestibu-laris lateralis. Smaller nucleus of nerve cells situated near the lateral recess with projections to the anterior horn of the spinal cord. A D

12 Superior vestibular nucleus. Nucleus vestibu-laris superior. Nucleus located above the lateral nucleus with projections to the medial longitudinal fasciculus and cerebellum. A D

13 Cochlear nuclei. Nuclei cochleares. Dorsal and ventral terminal nuclei of the cochlear division of the vestibulocochlear nerve. Both lie below the lateral recess. A D

14 Trapezoid body. Corpus trapezoideum. Mass of fibers arising from the cochlear nuclei that forms part of the auditoy pathway. D

15 Anterior nucleus of trapezoid body. Nucleus corporis trapezoidei anterior. Smaller nucleus situated posterolaterally in the trapezoid body. D

16 Posterior nucleus of trapezoid body. Nucleus corporis trapezoidei posterior. It lies behind the anterior nucleus. D

17 Lateral lemniscus. Lemniscus lateralis. Ascending continuation of the trapezoid body. Part of the hearing pathway. D

18 Nucleus of lateral lemniscus. Nuclei lemnisci lateralis. Ganglion cells interspersed in the lateral lemniscus.

19 Fourth ventricle. Ventriculus quartus. Dilatation of the lumen of the embryonic neural tube in the rhombencephalon. D

20 Rhomboid fossa. Fossa rhomboidea. Floor of 4th ventricle. A C

21 Lateral recess. Recessus lateralis. Lateral corner of the 4th ventricle ending with the lateral aperture. C D

22 Median sulcus. Sulcus medianus. Median furrow passing through the rhomboid fossa. C

23 Medial eminence. Eminentia medialis. Oblong elevation located between the median sulcus and the sulcus limitans. C

24 Facial colliculus. Colliculus facialis. Prominence above the medullary striae produced by the genu of the facial nerve and the nucleus of the abducens nerve. C

25 Limiting sulcus. Sulcus limitans. Shallow furrow situated lateral to the medial eminence. C

26 Vestibular area. Area vestibularis. Field above the vestibular nuclei and lateral to the limiting sulcus at the beginning of the lateral recess. C

27 Superior fovea. Fovea superior. Pit situated lateral to the facial colliculus. C

28 Locus ceruleus. Locus caeruleus. Elongated group of bluish cells located in the lateral wall of the 4th ventricle and under it. C

29 Inferior fovea. Fovea inferior. Pit at the apex of the trigone of the vagus nerve. C

30 Medullary striae. Striae medullares. Strongly myelinated transverse nerve bundles from the arcuate nucleus to the cerebellum. C

31 Trigone of hypoglossal nerve. Trigonum nervi hypoglossi (t. hypoglossale). Triangular bulge over the nucleus of the hypoglossal nerve located between the median sulcus and the sul-cus limitans. C

32 Funiculus separans. Transparent strip of ependyma between the trigone of the vagus nerve and the area postrema. C

33 Trigone of vagus nerve. Trigonum nervi vagi (t. vagale). Triangle over the dorsal nucleus of the vagus nerve caudal to the trigone of hypo-glossal nerve. C

34 Area postrema. A triangular field caudal to the trigone of the vagus with highly vascularized, glia-rich tissue. C

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