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Lower Limb Anatomy + Intrinsic Back Muscles > Intrinsic Muscles of the Back > Flashcards

Intrinsic Muscles of the Back Flashcards

1
Q

How many Muscles make up the Superficial (Spinotransversales) Layer?

A

2 - Splenius Captius

Splenius Cervicis

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2
Q

What is the Origin of Splenius Capitus?

A

Lower Aspect of Ligamentum Nuchae and the Spinous Processes of C7-T3/4 Vertebrae

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3
Q

What is the Attachment of Splenius Capitus?

A

Mastoid Process and the Occipital Bone of the Skull

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4
Q

What is the Action of Splenius Capitus?

A

Rotate head to Same Side.

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5
Q

What is the Innveration of Splenius Capitus?

A

Posterior Rami of Spinal Nerves C3 and C4

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6
Q

What is the Origin of Splenius Cervicis?

A

Spinous Processes of T3-T6 Vertebrae

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7
Q

What is the Attachment of Splenius Cervicis?

A

Transverse Processes of C1-C3/4

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8
Q

What is the Action of Splenius Cervicis?

A

Rotate Head to the Same Side.

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9
Q

What is the Innervation of Splenius Cervicis?

A

Posterior Rami of the Lower Cervical Spinal Nerves

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10
Q

What is the Joint Action of Splenius Capitus and Splenius Cervicis?

A

Extend the Head and Neck

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11
Q

How many Muscles make up the Intermediate Layer?

A

3 - Iliocostalis (Most Lateral)
Longissimus
Spinalis (Most Medial)

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12
Q

What do the Intermediate Muscles Collectively Form?

A

Erector Spinae

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13
Q

Where is the Erector Spinae Located in Relation to the Spinal Column

A

Posteriolaterally, between the Vertebral Spinous Processes and the Costal Angle of the Ribs

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14
Q

What do the Intermediate Muscles have in Common?

A 
Common Tedinous Origin Arising from:
•	Lumbar and Thoracic Vertebrae
•	Sacrum
•	Posterior aspect of the Iliac Crest
•	Sacroiliac and Supraspinous Ligaments
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15
Q

What is the Origin of Iliocostalis?

A

Common Tendinous Origin

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16
Q

What is the Attachment of Iliocostalis?

A

Costal Angle of the Ribs and the Cervical Spinous Processes

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17
Q

What is the Action of Iliocostalis?

A

Acts Unilaterally to Laterally Flex the Vertebral Column. Acts Bilaterally to Extend the Vertebral Column and the Head.

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18
Q

What is the Innervation of Iliocostalis?

A

Posterior Rami of the Spinal Nerves

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19
Q

What is the Origin of Longissimus?

A

Common Tendinous Origin

Largest of the 3. Can be Divided into 3 Parts – Thoracic, Cervicis and Capitis.

20
Q

What is the Attachment of Longissimus?

A

Lower Ribs, the Transverse Processes of C2-T12 and the Mastoid Process of the Skull.

21
Q

What is the Action of Longissimus?

A

Acts Unilaterally to Laterally Flex the Vertebral Column. Acts Bilaterally to Extend the Vertebral Column and the Head.

22
Q

What is the Innervation of Longissimus?

A

Posterior Rami of the Spinal Nerves

23
Q

What is the Origin of Spinalis?

A

Common Tendinous Origin

24
Q

What is the Attachment of Spinalis?

A

Spinous Processes of C2, T1-T8 and the Occipital Bone of the Skull.

25
Q

What is the Action of Spinalis?

A

Acts Unilaterally to Laterally Flex the Vertebral Column. Acts Bilaterally to Extend the Vertebral Column and the Head.

26
Q

What is the Innervation of Spinalis?

A

Posterior Rami of the Spinal Nerves

27
Q

What are the Main Deep Muscles of the Back?

A

Semispinalis (Most Superficial)
Multifidus (Deep to Semispinalis)
Rotatores (Most Common in Thoracic Region)

28
Q

What is the Origin of Semispinalis?

A

Transverse Processes of C4-T10. The Fibres Ascend 4-6 Vertebral Segments.

29
Q

What is the Attachment of Semispinalis?

A

Spinous Processes of C2-T4 and the Occipital Bone of the Skull

30
Q

What is the Action of Semispinalis?

A

Extends and Contralaterally Rotates the Head and Vertebral Column

31
Q

What is the Innervation of Semispinalis?

A

Posterior Rami of the Spinal Nerves

32
Q

What is the Origin of Multifidus?

A

Sacrum, Posterior Iliac Spine, Common Tendinous Origin of the Erector Spinae, Mammillary Processes of the Lumbar Vertebrae, Transverse Processes of T1-T3 and Articular Processes of C4-C7.

33
Q

What is the Attachment of Multifidus?

A

The Fibres Ascend 2 Vertebral Levels then Attach to the Spinous Processes of the Vertebrae.

34
Q

What is the Action of Multifidus?

A

Stabilises the Vertebral Column

35
Q

What is the Innervation of Multifidus?

A

Posterior Rami of the Spinal Nerves

36
Q

What is the Origin of Rotatores?

A

Vertebral Transverse Processes

37
Q

What is the Attachment of Rotatores?

A

Lamina and Spinous Processes of the Immediately Superior Vertebrae

38
Q

What is the Action of Rotatores?

A

Stabilises the Vertebral Column, and Has a Proprioception Function.

39
Q

What is the Innervation of Rotatores?

A

Posterior Rami of the Spinal Nerves

40
Q

What are the Minor Deep Muscles of the Back?

A

Interspinales
Intertranversari
Levatores Costarum

41
Q

Attachments of Interspinales

A

Span between Adjacent Spinous Processes

42
Q

Action of Interspinales

A

Acts to Stabilise the Vertebral Column

43
Q

Attachments of Intertranversari

A

Spans between Adjacent Transverse Processes

44
Q

Action of Intertranversari

A

Acts to Stabilise the Vertebral Column

45
Q

Attachments of Levatores Costarum

A

Originates form the Transverse Processes of C7-T11 and Attaches to the Rib Immediately Below.

46
Q

Action of Levatores Costarum

A

Acts to Elevate the Ribs.

Lower Limb Anatomy + Intrinsic Back Muscles (13 decks)

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