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Neuroanatomy > Lecture 7 > Flashcards

Lecture 7 Flashcards

1
Q

What fibres does the spinal cord receive from peripheral receptors?

A

Primary afferent fibres

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2
Q

What are two functions of the spinal cord?

A

Sends motor axons to skeletal muscle

Provides communications between brain and periphery

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3
Q

Where do the anterior and posterior roots of the spinal cord pass through?

A

Subarachnoid space

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4
Q

When the posterior root passes through the appropriate intervertebral foramina, what happens?

A

It enlarges by the posterior root ganglion

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5
Q

What produces posterior and anterior rami?

A

Fusion of the roots

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6
Q

Where is the spinal cord continuous with the medulla?

A

Site just before the foramen magnum

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7
Q

What is the termination of the spinal cord called?

A

Conus medularis

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8
Q

What is the continuation of the thin cord of the conus medularis?

A

Filum terminale

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9
Q

What level does the spinal cord end?

A

L1

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10
Q

What level does the dural sac end?

A

S2

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11
Q

The spinal cord is suspended in the canal by a ribbon of tissue called?

A

Denticulate ligament

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12
Q

What is the denticulate ligament made of?

A

Pia and arachnoid tissue

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13
Q

Where does the dorsal and ventral roots come together to form the spinal nerve?

A

Intervertebral canal

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14
Q

What is the spinal cord made of?

A

Outer layer of white matter and inner layer of grey matter in the shape of a ‘H’

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15
Q

Where does the central canal open into rostrally?

A

4th Ventricle

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16
Q

Where is grey matter greatest in the spine?

A

Cervical and lumbar enlargements

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17
Q

Where is white matter greatest?

A

Cervical level

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18
Q

What is the white matter made up of?

A

Dorsal, lateral and ventral fasciculi

19
Q

What is the grey matter divided into?

A

Left/right dorsal horns

Left/right ventral horns

20
Q

At T1 to L2 there is a smaller horn called?

A

Lateral horn

21
Q

What does the lateral horn made from?

A

Preganglionic sympathetic neurons

22
Q

What is rexed laminae?

A

Ten cell lamina in grey matter of the spinal cord

23
Q

Overlying lamina I is what?

A

The tract of Lissauer

24
Q

Afferents entering the spinal cord divide into?

A

Ascending and descending branches

25
Q

Where do the ascending and descending branches travel in?

A

Tract of Lissauer before penetrating the grey matter

26
Q

What are the three major longitudinal arteries?

A

One anterior and two posterior

27
Q

What arteries are derived from vertebral, deep cervical and lumbar arteries?

A

Segmental arteries

28
Q

What arteries travel along the dorsal and ventral roots?

A

Radicular arteries

29
Q

Where do longitudinal veins drain to?

A

Cerebellar veins and cranial sinuses

30
Q

Where do segmental veins drain to?

A

Vertebral plexuses

31
Q

What is the space between the dura and bone in the spinal canal?

A

Epidural space

32
Q

What is contained in the epidural space?

A

Adipose tissue and the anterior and posterior epidural venus plexuses

33
Q

What does the spinothalamic tract carry?

A

Pain, temperature and deep pressure

34
Q

What tract controls precision and speed of skilled movements?

A

Corticospinal tract

35
Q

What tract forms visible ridges referred to as pyramids on the anterior surface of the medulla?

A

Corticospinal tract

36
Q

Where do 85% of fibres cross in the caudal medulla?

A

Decussation of the pyramids

37
Q

What tract has excitatory control of tone of limb flexor muscles?

A

Rubrospinal tract

38
Q

What tract has fibres originate in red nucleus of midbrain?

A

Rubrospinal tract

39
Q

What is the small tract with input mostly to cervical segments?

A

Tectospinal Tract

40
Q

Where do fibres originate in the tectospinal tract?

A

Superior colliculus

41
Q

What region of the midbrain has the superior colliculus?

A

Tectum

42
Q

What tract has excitatory input to antigravity extensor muscles?

A

Lateral Vestibulospinal Tract

43
Q

Where do the fibres originate in the lateral Vestibulospinal tract?

A

Ipsilateral vestibular nuclei of pons and medulla

44
Q

The motor systems outside the pyramidal tract are referred to as?

A

Extrapyramidal system

Neuroanatomy (29 decks)

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