Anatomy of Back, Spine and Spinal Cord Flashcards

1
Q

What are the extrinsic muscles of the back?

A

Rhomboids, trapezius, levator scapulae and latissimus dorsi = attach back to pectoral girdle and move upper limb

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2
Q

Where are the intrinsic back muscles located?

A

Entirely within the back = maintain back posture and move the spine

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3
Q

What are the two groups of intrinsic back muscles?

A

Erector spinae = superficial

Transversospinalis = deep

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4
Q

What are some features of erector spinae?

A

3 vertical muscle groups located lateral to the spine

Low back pain may be due to erector spinae strain

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5
Q

What is the inferior attachment of erector spinae?

A

Common tendon attaches to sacrum and iliac crest

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6
Q

Where do individual muscle fibres of erector spinae attach superiorly via a tendon?

A

Either a rib (between angles and tubercles), transverse process of a vertebra or a spinous process of a vertebra

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7
Q

Where is transversospinalis located?

A

Located within the groove between the transverse and spinous processes

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8
Q

Where do the individual muscles fibres of transversospinalis attach between?

A

A vertebra and the skull
A vertebra and a rib
One vertebra and another
Sacrum and a vertebra

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9
Q

What is the nerve supply to the intrinsic muscles of the back?

A

Segmental nerve supply as per dermatome/myotome pattern

Posterior rami branches

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10
Q

What are the functions of the intrinsic muscles of the back?

A

Help maintain posture
Support the spine
Extend the spine

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11
Q

What happens when erector spinae contracts?

A

Bilateral contraction = extension of spine

Unilateral contraction = lateral flexion of spine

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12
Q

What muscles are involved in flexion of the spine?

A

Psoas major and rectus abdominis

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13
Q

What are the typical features of the cervical vertebrae?

A

Transverse foramen, bifid spinous process and triangular vertebral foramen

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14
Q

What are some features of C1 (atlas)?

A

No body or spinous process

Has posterior arch and superior arch instead

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15
Q

What are some features of C2 (axis)?

A

Has odontoid process

Projects superiorly from body

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16
Q

What is the first vertebrae palpated in most people?

A

C7 = vertebrae prominens

17
Q

What are the atlanto-occipital joints?

A

Synovial joints with loose capsule = between the occipital condyles and the superior articular facets of atlas

18
Q

What movements do the atlanto-occipital joints allow?

A

Flexion and extension of the neck

A little lateral flexion and rotation

19
Q

What are the 3 articulations of the atlanto-axial joint?

A

2 between the inferior articular facets of atlas and superior articular facets of axis
1 between anterior arch of atlas and odontoid process of axis

20
Q

What are some features of the atlanto-axial joint?

A

All articulations are synovial

Main movement is rotation

21
Q

What are the categories of dislocation for cervical vertebrae?

A

Stage 1 = flexion sprain
Stage 2 = anterior subluxation, 25% translation
Stage 3 = 50% translation
Stage 4 = complete dislocation

22
Q

What level does the spinal cord end?

A

At L2

23
Q

Where does the subarachnoid space end?

A

At the level of S2

24
Q

What does the cauda equina consist of?

A

All L2-5 spinal nerve roots descending towards their respective intervertebral foraminae

25
Q

Where is the safest place to insert the needle when giving spinal or epidural anaesthetic?

A

Where subarachnoid space surrounds the cauda equina (not the spinal cord)
Where vertebrae aren’t fused

26
Q

At what level is the needle usually inserted for giving spinal or epidural anaesthetic?

A

L3/4 interspace

27
Q

In what situation should a lumbar puncture never be performed?

A

In cases of raised ICP

28
Q

What structures does the needle pass through when giving spinal anaesthetic?

A

Supraspinous ligament, interspinous ligament, ligamentum flavum, epidural space, dura mater, arachnoid mater, finally reaches subarachnoid space

29
Q

What structures does the needle pass through when giving epidural anaesthetic?

A

Supraspinous ligament, interspinous ligament, ligamentum flavum, epidural space

30
Q

Where is local anaesthetic injected when giving caudal anaesthesia?

A

Into the sacral hiatus to anaesthetise the sacral spinal nerve roots of the cauda equina

31
Q

What is a laminectomy used for?

A

To access the spinal canal = posterior exposure of spinal cord and/or spinal roots

32
Q

What occurs in a laminectomy?

A

Removal of one or more spinous processes and the adjacent lamina = relieves pressure on spinal cord or nerve roots

33
Q

What can a laminectomy be used to treat?

A

Tumour, herniated disc or bone hypertrophy