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Spinal cord 277

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4

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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11

 

 

 

 

 

 

 

 

 

 

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8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19

 

 

1

A Cross section of spinal cord

9;11

B

Columns of spinal cord

28

 

 

7

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

26

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14

 

 

 

 

 

 

 

 

 

 

 

 

29

 

 

 

16a

12

13

 

 

 

 

 

 

 

 

 

27

 

 

 

 

 

 

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24

 

25

 

 

 

 

 

 

 

23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32

 

 

 

 

 

 

 

 

 

19

 

 

 

 

 

C Cross section of spinal cord with tracts

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278 Spinal cord, Brain

1

Spinotectal tract. Tractus spinotectalis. Its

1

fibers arise from the posterior horn of the op-

posite side, run in the lateral spinothalamic

2tract and end in the tectal lamina. A

2Spinothalamic tract. Tractus spinothalamicus. Lies in the lateral funiculus and arises primarily

3from the opposite side. Its fibers transmit pain and temperature sensations. A

4 3 Anterior spinocerebellar tract. Tractus spino-

 

cerebellaris anterior [[Gowers]]. It extends

5

partly from the opposite side and transmits to

the cerebellum information necessary for the

 

 

coordination of movements concerning muscle

6extension and limb position. A

 

4 Posterior spinocerebellar tract. Tractus spino-

7

cerebellaris posterior [[Flechsig]]. Its fibers are

uncrossed and function similar to those of the

 

 

anterior spinocerebellar tract. A

85 Dorsolateral tract. Tractus dorsolateralis [[Lissauer]]. Bundle of fine myelinated and nonmy-

9elinated fibers between the apex of the posterior horn and the surface. The fibers are short and some form lateral branches of posterior

10 root fibers. A

6 Spino-olivary tract. Tractus spino-olivaris

11[[Hellweg]]. Predominantly crossed fibers to the olive. They lie by the anterior root fibers together with the olivospinal tract. A

127 Spinoreticular tract. Tractus spinoreticularis. Its fibers lie beside the spino-olivary tract and

13end in the reticular substance of the medulla oblongata. A

8Posterior funiculus. Funiculus posterior. White

14

matter between the posterior horns. A

 

9Posterior fasciculi proprii. Fasciculi proprii

15posteriores. They lie directly on the gray matter and unite individual spinal cord segments for

16coordinated activity.

Septomarginal fasciculus. Fasciculus septo-10

marginalis. Bundle of mostly descending fibers

17situated along the posterior median septum in the lower half of the thoracic spinal cord. A

1811 Interfascicular fasciculus. Fasciculus interfascicularis. Bundle of mostly descending fibers [comma tract of Schultze] located chiefly in the

19upper half of the thoracic spinal cord between the fasciculi gracilis and cuneatus. A

2012 Fasciculus gracilis [[Goll]]. Medial fasciculus that contains fibers from the lower half of the spinal cord which function in the transmission

21of tactile and proprioceptive sensory information. A

2213 Fasciculus cuneatus [[Burdach]]. It begins with the upper half of the thoracic cord an likewise contains fibers for transmission of tactile and

23proprioceptive impulses. A

14 BRAIN. Encephalon.

2415 BRAINSTEM. Truncus encephali. It extends from the medulla oblongata to the midbrain.

25According to some, the diencephalon and insula likewise belong to the brainstem.

16HINDBRAIN. Rhombencephalon. It includes the brain substance around the rhomboid fossa, thus the cerebellum, pons with dorsally attached substance and medulla oblongata. B

17MEDULLA OBLONGATA (BULBUS). Beginning at the lower margin of the pons, it extends up to the root fibers of C1. In the rhomboid fossa it arises from the medullary striae of the 4th ventricle. B

18Anterior median fissure. Fissura mediana anterior. Anterior groove continuous with that of the spinal cord. The pyramidal decussation crosses over it. C

19Pyramid. Pyramis [medullae oblongatae]. Longitudinal elevation of pyramidal tract fibers to the right and left of the anterior median fissure. It ends with the pyramidal decussation. C

20Pyramidal decussation. Decussatio pyramidum (dec. pyramidalis anterior motoria). 3−5 bundles of lateral pyramidal tract fibers crossing to the opposite side at the end of the medulla. C

21Anterolateral sulcus. Sulcus anterolateralis. Furrow lateral to the pyramid for transmission of the hypoglossal nerce. C

22Lateral funiculus. Funiculus lateralis. Continuation of the lateral funiculus of the spinal cord up to the olive. C

23Olive. Oliva. Bean-shaped prominence about 1.5 cm long between the roots of cranial nerves X and XII. it is produced by the nuclei lying beneath it. C

24Anterior external arcuate fibers. Fibrae arcuatae externae anteriores. Fibers from the arcuate nucleus coursing over the caudal end of the olive to the caudal cerebellar peduncle. Part of the pontocerebellar tract. C

25Retro-olivary sulcus. Sulcus retro-olivaris. Furrow behind the olive. C

26Retro-olivary area. Area retro-olivaris. Area behind the olive. C

Spinal Cord, Brain 279

8

12

 

 

13

 

10

 

 

5

 

 

4

11

9

 

 

2

3

1

67

A Cross section of spinal cord

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26

 

 

 

 

 

 

 

23

 

 

19

 

 

 

 

25

 

 

 

 

21

 

 

 

 

 

 

 

 

21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

22

20

 

C Medulla oblongata from above

16

17

B Rhombencephalon

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2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

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280

Brain

 

 

 

 

1

Posterolateral sulcus. Sulcus posterolateralis.

19

Internal arcuate fibers. Fibrae arcuatae inter-

1

 

 

Furrow reaching up to the lateral recess of the

 

nae. Fiber component of the medial lemniscus

 

 

 

4th ventricle. Site of exit of cranial nerves IX, X

 

arising from the nucleus of the posterior

2

 

 

and XI. A

 

funiculus. C

 

2

Inferior cerebellar peduncle. Pedunculus cere-

20

Decussation of medial lemniscus. Decussatio

 

3

 

 

bellaris inferior. Inferior connection to the cere-

 

lemniscorum medialium (d. sensoria). Formed

 

 

bellum with fibers of the posterior spinocere-

 

by fibers of nuclei gracilis ans cuneatus, second

 

 

 

 

 

 

 

bellar tract and olive. A

 

order neurons of posterior funiculus. C D

4

 

 

 

3

Trigeminal tubercle (tuber cinereum). Tuber-

21

Medial lemniscus. Lemniscus medialis. Con-

 

 

 

culum trigeminale. Low lateral elevation above

 

tinuation of second order neuron of posterior

5

 

 

the spinal tract of the trigeminal nerve. B

 

funiculus after decussation of lemniscus [bul-

 

4

Cuneate fasciculus. Fasciculus cuneatus.

 

bothalamic tract]. D

 

22

Tectospinal tract. Tractus tectospinalis. Decus-

6

 

 

Lateral part of posterior funiculus coming from

 

 

 

the upper half of the body. A

 

sated connection between the quadrigeminal

 

 

5 Cuneate tubercle. Tuberculum cuneatum. Ob-

 

plate and the spinal cord. It lies between the fa-

7

 

 

cial and trigeminal nuclei. D

 

 

long prominence at the end of the cuneate

 

 

 

 

23

Medial longitudinal fasciculus. Fasciculus

 

 

 

fasciculus produced by the nucleus cuneatus. A

8

6

Fasciculus gracilis. Medial part of posterior

 

longitudinalis medialis. Nerve fiber bundle for

 

reciprocal connection to the motor nuclei of

 

 

 

 

 

funiculus coming from the lower half of the

 

ocular muscles, as well as vestibular, accessory

9

 

 

body. A

 

and cervical muscle nuclei. C

7Gracile tubercle (clava). Tuberculum gracile. 24 Posterior longitudinal fasciculus. Fasciculus

10

 

 

Oblong bulge over the nucleus gracilis. A

 

longitudinalis posterior [[Schütz]]. Connection

 

8

Posterior

median sulcus. Sulcus

medianus

 

between the hypothalamus, III, VII, XII cranial

 

 

nerve nuclei, nucleus ambiguus, tractus solitar-

11

 

 

posterior. Posterior furrow continued from the

 

 

 

 

ius and tractus salvatorius in the floor of the

 

 

spinal cord and closed above by a medullary

 

 

 

 

 

rhomboid fossa. C

 

 

 

lamella (obex). A

 

 

12

 

 

 

25

Spinal tract of trigeminal nerve. Tractus spi-

9

Sections through the medulla oblongata. Sec-

 

 

 

tiones medullae oblongatae.

 

 

nalis nervi trigeminalis. Descending fibers of

 

 

 

 

 

13

 

 

 

 

the trigeminal nerve for transmission of pain

10

Pyramidal fasciculus (tract). Fasciculus py-

 

 

and temperature stimuli. C D

 

 

 

ramidalis. Nerve tract for the transmission of

26 Spinal nucleus of trigeminal nerve. Nucleus

14

 

 

impulses concerned with conscious move-

 

 

 

spinalis nervi trigeminalis. Continuous with the

 

 

 

ments. C D

 

 

 

substantia gelatinosa in the spinal cord; this nu-

 

11

Corticospinal fibers. Fibrae corticospinales.

 

15

 

cleus receives the fibers of the spinal tract of the

 

 

Fibers from the precentral gyrus of the cortex to

 

trigeminal nerve. C D

 

 

 

 

 

 

 

the anterior horn cells of the spinal cord.

27

Reticular formation (substance). Formatio

16

 

 

 

 

 

 

 

12

Corticonuclear fibers. Fibrae corticonu-

 

(substantia) reticularis. Cells lying scattered in

 

 

 

cleares. Fibers from the precentral gyrus of the

 

the tegmentum in the vicinity of the vagus, ves-

17

 

 

cortex to the motor nuclei of cranial nerves.

 

tibular and facial nuclei with a regulatory effect

 

 

13

Decussation of the pyramids. Decussatio py-

 

on the muscles of the pharyngeal arch and other

 

 

 

muscles of the body. It extends cranially and

 

 

 

18

 

 

ramidum (dec. motoria). Fibers of the lateral py-

 

 

 

 

caudally. C

 

 

 

ramidal tract with 3−5 bundles crossing at the

28

Inferior olivary nucleus. Nucleus olivaris infe-

19

 

 

end of the medulla oblongata. B

 

 

14

Fasciculus

gracilis. Medial part of

posterior

 

rior. Main olviary nucleus lying below the olive.

 

 

 

It is shaped like a thick-walled pouch that opens

 

 

 

funiculus coming from the lower half of the

 

20

 

 

 

medially and is connected with the spinal cord

 

 

body.

 

 

 

 

 

 

 

 

and cerebullum. C

 

 

15

Nucleus gracilis. Nucleus of fasciculus gracilis

29

Amiculum of the olive. Amiculum olivare.

21

 

 

medial to cuneate nucleus. D

 

 

Fibrous sheath that surrounds and contains af-

 

 

16

Cuneate

fasciculus. Fasciculus

cuneatus.

 

ferent and efferent fibers of the olivary nucleus. C

22

 

 

Lateral part of posterior funiculus coming from

30

Hilum of inferior olivary nucleus. Hilum nu-

 

 

 

the upper half of the body.

 

 

clei olivaris inferioris. Opening of the medially

23

 

17

Cuneate nucleus. Nucleus cuneatus. Nucleus of

 

oriented pouch-like olivary nucleus. C

 

 

Medial accessory olivary nucleus. Nucleus

 

 

 

fasciculus cuneatus lateral to the nucleus 31

24

 

 

gracilis. D

 

 

 

olivaris accessorius medialis. It is located in front

 

18

Accessory cuneate nucleus. Nucleus cuneatus

 

of the hilum of the olivary nucleus. C

 

 

 

accessorius. Gray matter lateral to the upper

32

Posterior accessory olivary nucleus. Nucleus

25

 

 

part of cuneate nucleus. Origin of external ar-

 

olivaris accessorius posterior. It is situated be-

 

 

 

cuate fibers which pass to the cerebellum. D

 

tween the olive and reticular formation. C

 

 

 

 

 

 

 

 

Brain 281

2

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8

 

 

 

 

 

 

1

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

A Rhomboid fossa

3

13

B Pons and medulla oblongata

26

20

24

23

 

27

 

25

 

 

 

 

 

19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31

 

 

 

 

 

 

 

 

 

 

 

 

 

28

 

 

 

 

 

 

 

 

21

 

 

32

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

29

10

C Section through medulla oblongata

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25

26

21 20

22

10

D Section through medulla oblongata

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