Back Muscles Flashcards

1
Q

-Muscle that runs from the transverse process of upper cervical vertebra to the medial border of the scapula
-Elevates the scapula
-Dorsal Scapular Nerve (C5)

A

Levator Scapulae Muscle

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2
Q

-Spinal Accessory Nerve (CN XI)
-most superficial muscle, overlays levator scapulae
-Upper, middle, and lower portions
-Upper: Shoulder elevation/extension of the head & neck
-Middle: Shoulder retraction
-Lower: Scapular depression and upward rotation

A

Trapezius Muscle

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3
Q

-Thoracodorsal Nerve
-originates from thoracolumbar fascia and iliac crest and inserts on the Bicipital (Intertubercular) Groove of the Humerus
-IR, Adducts, and Extends the GH Joint (same as Teres Major)

A

Latissimus Dorsi Muscle

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4
Q

-Dorsal Scapular Nerve (C5)
-Deep to trapezius (same level as Levator Scapulae)
-Major and Minor (sometimes can’t differentiate between them)
-Originates on the spinous processes of the 2nd-5th thoracic vertebra and inserts on the medial border of the scapula
-Retract and rotate the scapula medially and upward

A

Rhomboid Muscles

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5
Q

-Extend the back (stand up straight), allow vertebra to rotate on themselves (look from side to side), and stabilize vertebrae (don’t let them slide around)

A

Function of Intermediate Back Muscles

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6
Q

What is the innervation for the intermediate back muscles?

A

Motor branches of the dorsal primary rami.
-Segmental: not just a single nerve that goes out. Go segment by segment all the way down.

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7
Q

Has medial and lateral branches. Curves around off of spinal nerve and goes in dorsal direction. Divides as it enters the back muscles:
-Medial branch: goes to skin. chiefly sensory.
-Lateral: stays within muscles, so motor branch

A

Dorsal Primary Rami

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8
Q

Splits off of spinal nerve and goes to innervate plexi

A

Ventral Primary Rami

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9
Q

Cluster of intermediate back muscles
-Function: erects the spine. Helps us stand up straight
-Iliocostalis Group
-Longissimus Group
-Spinalis Group

A

Erector Spinae

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10
Q

Most Lateral Erector Spinae Group.
-Iliocostalis Cervicis: attaches to cervical spine
-Iliocostalis Thoracis: attaches to vertebra of thoracic spine
-Iliocostalis Lumborum: Attaches to lumbar vertebra

A

Iliocostalis Group

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11
Q

Middle Erector Spinae Group
-Longissimus Capitis
-Longissimus Thoracis
-Longissimus Cervicis

A

Longissimus Group

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12
Q

Most medial erector spinae group; right up against the spinous processes.
-Spinalis Capitis
-Spinalis Thoracis
-Spinalis Cervicis

A

Spinalis Group

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13
Q

Thin muscles that help to stabilize the spine and rib cage
-Superior: Contract to elevate ribs to expand chest to inhale. Attach to ribs from vertebral column.
-Inferior: reverse function. Contract to pull ribs down to forcefully exhale. Run from lumbar vertebra to lower rib cage

A

Serratus Posterior Superior & Inferior Muscles

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14
Q

Deepest group of back muscles.
-Run from transverse processes out to spinous processes
Superficial to Deep:
-Semispinalis, Multifidus, and Rotatores

A

Transversospinalis Group

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15
Q

Deep Group of muscles. Most superficial of the deep group.
-Mostly tendon
-Cross about 4-6 vertebral segments (Thoracis, Cervicis, and Capitis)
-Run diagonally; originate on transverse processes and insert in a diagonal direction on the spinous process of a vertebra 4-6 segments up.

A

Semispinalis Group

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16
Q

Deep muscle. Short but powerful.
-Cross 2-4 vertebral segments
-Best muscles for extension
-Run from transverse process to spinous process
-Sacralis, Lumborum, Thoracis, and Cervicis regions

A

Multifidus Group

17
Q

Deepest group of deep muscles.
-Tiny muscles, cross 1-2 vertebral segments
-If 1: Brevis. If 2: Longus
-Short muscles lying between the vertebrae
-Run from transverse process to ribs.
-Sacralis, Lumborum, Thoracis, Cervicis

A

Rotatores Group

18
Q

A minor deep back muscle group; located between the transverse processes of vertebrae.
-Gives strength to the spinal column and holds it together as one unit.
-Has a lumbar and cervical group

A

Intertransversarii Group

19
Q

A minor deep back muscle that runs between the spinous processes of vertebrae. Assists with spine stability.
-Has a lumbar and cervical group

A

Interspinales Group

20
Q

Muscles that originate from transverse processes of thoracic vertebra and insert diagonally on the rib directly below or two ribs below it.
-Stabilization of the vertebral column against the ribs
-Can switch origin and insertion to lift the ribs up to inhale deeply

A

Levatores Costarum Muscles

21
Q

A “V” shaped muscle that starts on the cervical vertebra and attaches to ligamentum nuchae and attaches to the back of the head.
-Inserts on the Mastoid Process
-Lies just deep to the Upper Trapezius m.

A

Splenius Capitis m.

22
Q

A muscle distal to the splenius capitis m.,
-Runs parallel to splenius capitis m.
-Attaches medially to the ligamentum nuchae

A

Splenius Cervicis m.

23
Q

Medial and Deep to Splenius Capitis.
-Fibers run straight up and down
-Attaches to the back of the head along the nuchal line
-Innervated by segmental nerves

A

Semispinalis Capitis m.

24
Q

Deep to the Semispinalis Capitis m.
-Forms an upside down “V” with the R and L muscles
-Vertex points upward and inserts on the Spinous Process of C2.
-Innervated by segmental nerves

A

Semispinalis Cervicis m.

25
Q

What are the muscles of the Occipital Triangle?

A

Rectus Capitis Posterior Major & Minor m.
Superior/Inferior Obliquus Capitis m.
-Function is to stabilize skull on spinal column

26
Q

What are the contents of the Suboccipital Triangle?

A

-Vertebral Artery (running horizontally)
-Suboccipital Nerve (DPR of C1) (innervates muscles of triangle)
-Posterior Bony Arch of C1 Vertebra
-Greater Occipital Nerve

27
Q

Nerve that comes off of C2 and emerges just underneath the lamina and exits out of the inferior aspect of the Suboccipital Triangle.
-Turns and goes across triangle, comes up, and grabs a little bit of Ligamentum Nuchae before spreading branches for sensory innervation to the back of the head
-No motor; just sensory
-Remember: V1 supplies sensation to forehead and all the way back to the crown. Sensation past the crown is this nerve.

A

Greater Occipital Nerve (C2)