Test #10 - Class 18: Muscles 73-84; Class #19: Muscles 85-92; Class #20: Muscles 93-99 Flashcards
What pattern do the paraspinal (paravertebral) muscles exist in?
A staggered pattern from the occipital bone to the sacrum.
How many layers are the paraspinal (paravertebral) muscles arranged?
3 layers; all covered in a more superficial layer of back and neck muscles
What are the 3 most superficial layer of muscles covering the 3 layers of the paraspinal muscles?
- Trapezius; 2. Rhomboids; and 3. Latissimus Dorsi
How many deep layer of paraspinal muscles?
3 muscles
What are the 3 deep layer of paraspinal muscles?
- Intertransversarii; 2. Interspinales; and 3. Rotatores
How big are and how many joints do the deepest layer of the paraspinal muscles cross?
Very small muscles that only span 1 joint
Deep layer of the paraspinal muscles: Intertransversarii
GL: POSTERIOR, BACK, DEEP (T.P. to T.P.)
O: Transverse process of inferior vertebrae
I: Transverse process of superior vertebrae
Deep layer of the paraspinal muscles: Interspinales
GL: POSTERIOR, BACK, DEEP (S.P. to S.P.)
O: Spinous process of inferior vertebrae
I: Spinous process of superior vertebrae
Deep layer of the paraspinal muscles: Rotatores
GL: POSTERIOR, BACK, DEEP (T.P. to S.P.)
O: Transverse processes of all vertebrae L5-C3
I: Spinous processes of next vertebrae superiorly
How many intermediate layer of paraspinal muscles?
2 muscles
What are the 2 intermediate layer of paraspinal muscles?
- Multifidus; and 2. Semispinalis
How big are and how many joints do the intermediate layer of the paraspinal muscles cross?
Slightly larger muscles which span 2-6 joints.
Intermediate layer of the paraspinal muscles: Multifidus
GL: POSTERIOR, BACK, DEEP (T.P. to S.P.)
O: Sacrum & transverse processes of L5-T1
I: Spinous processes of all vertebrae
Intermediate layer of the paraspinal muscles: Semispinalis
GL: POSTERIOR, BACK, DEEP
O: Transverse processes of thoracic and cervical vertebrae
I: Spinous processes from T4-C2, Occiptial bone between Superior and Inferior Nuchal Lines
How many regions does Semispinalis have?
3 regions
What are the 3 regions of semispinalis?
- S. Capitis; 2. S. Cervicis; and 3. S. Thoracis
“Head, Neck and Torso”
S.N.L. down to S.P. T4; T.P. T1 down to T.P. T10
What is the only muscle on the sacrum?
Multifidis
How many superficial layer of paraspinal muscles?
3 muscles
What are the 3 superficial layer of paraspinal muscles?
- Spinalis; 2. Longissimus; and 3. Iliocostalis
What are the 3 superficial layer of paraspinal muscles collectively known as?
The Erector Spinae group.
How big are and how many joints do the superficial layer of the paraspinal muscles (aka the Erector Spinae) cross?
Longer muscles which span 8-10 joints.
What is the order of the Erector Spinae Group (from most lateral to most medial)?
- Iliocostalis; 2. Longissimus; and 3. Spinalis
What is the thoracolumbar aponeurosis?
A dense sheet of connective tissue which serves as an attachment for muscles of the low back and abdominal regions. It can be up to 1” thick.
Superficial layer of the paraspinal muscles/Erector Spinae Group: Iliocostalis
GL: POSTERIOR, BACK, DEEP
O: Bodies of ribs 12-3
I: All ribs, transverse processes of C7-C4
Superficial layer of the paraspinal muscles/Erector Spinae Group: Longissimus
GL: POSTERIOR, BACK, DEEP
O: Transverse processes of L5-C4
I: Transverse processes of all vertebrae from T12-C2, ribs and mastoid process
Superficial layer of the paraspinal muscles/Erector Spinae Group: Spinalis
GL: POSTERIOR, BACK, DEEP
O: Spinous processes of upper lumbar and lower thoracic and spinous process of C7
I: Spinouis processes of upper thoracic and cervical vertebrae
What do the paraspinal muscles collectively act to do?
To hold bipeds upright against gravity.
What puts the paraspinal muscles in a constant state of stress?
They are always in a state of partial, sustained contraction to maintain and upright posture.
How many neck muscles?
6 muscles
What are the 6 neck muscles?
- Anterior Scalenes; 2. Middle Scalenes; 3. Posterior Scalenes; 4. Splenius Capitis; 5. Splenius Cervisis; and 6. Sternocleidomastoid
Neck Muscles: Anterior Scalenes
GL: LATERAL, NECK, SUPERFICIAL
O: Transverse processes of C3-C6
I: FIRST RIB
Neck Muscles: Middle Scalenes
GL: LATERAL, NECK, SUPERFICIAL
O: Transverse processes of C2-C7
I: FIRST RIB
Neck Muscles: Posterior Scalenes
GL: LATERAL, NECK, SUPERFICIAL
O: Transverse processes of C4-C6
I: SECOND RIB
Which scalene(s) insert on the 1st rib?
- Anterior and Middle Scalenes
Which scalene(s) insert on the 2nd rib?
- Posterior Scalenes
What is the brachial plexus?
A group of nerves emerging from the spinal cord to innervate the upper extremity.
Where does the brachial plexus run?
Between the anterior and middle scalenes.
What makes up the borders of the “Posterior Triangle”?
- Sternocleidomastoid (SCM); 2. Upper Trapezius; and 3. Clavicle
How many muscles are located within the Posterior Triangle?
6 muscles
What 6 muscles are located within the Posterior Triangle (from superior to inferior)?
- Semispinalis Capitis; 2. Splenius Capitis; 3. Levator Scapulae; 4. Posterior Scalenes; 5. Middle Scalenes; and 6. Anterior Scalenes
Neck Muscles: Splenius Capitis*
GL: Posterior, Neck, Intermediate
O: Ligament of Nuchae, Spinous processes of C7-T3
I: Mastoid process and Superior Nuchal Line of the occipital bone
Major Ligament: Ligamentum Nuchae (Nuchal Ligament)
Runs from the External Occipital Protuberance (EOP) of the occipital bone to the spinous process of the thoracic vertebra T1. Attachment point for muscles.
Neck Muscles: Splenius Cervisis*
GL: Posterior, Neck, Intermediate
O: Spinous processes of T3-T6
I: Transverse processes of C1-C3
Neck Muscles: Sternocleidomastoid*
GL: Anterior/Lateral, Neck, Superficial
O: 1) Sternal head: Manubrium; 2) Clavicular head: Medial 1/3 of the clavicle
I: Mastoid process, Superior Nuchal Line of the occipital bone