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The Muscles of the Back
n/a
40
Anatomy
Undergraduate 3
09/12/2008

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Term
What are the three types of back muscles?
Definition
Superficial, intermediate, deep
Term
What does superficial back muscle mean?
Definition
Attached to the bones of the upper extremety and are extrensic muscles
Term
What does extrensic muscle mean?
Definition
do not move the spine
Term
What does intermediate back muscle mean
Definition
attached to teh ribs and are involved in respiration, also referred to as extrensic back muscles
Term
What does deep back muscle mean?
Definition
attached to the spine and are intrinsic
Term
what does an intrinsic back muscle do?
Definition
moves the spine
Term
What are the superficial and intermediate back muscles enervated by?
Definition
the ventral ramii of the intercostal nerves
Term
What are the deep back muscles enervated by
Definition
the dorsal ramii of the intercostal nerves
Term
What are the characteristics of the thorocolumbar fascia?
Definition
superficial of the posterior layer is thicker, erector spinae is between superficial and deep
Term
What are the muscles of the back?
Definition
Trapezius, latissmus dorsi, levator scapulae, rhomboid major, rhomboid minor, serratus posterior superior, serratus posterior inferior, splenius capitis, splenius cervices, erector spinae
Term
What are the three parts of the trapezius
Definition
superior, medial, inferior
Term
What are the origins of the trapezius
Definition
superior nuchal line, external occipital protuberance, spinous processes of C7-C12
Term
what are the insertions of the trapezius
Definition
acromion and spine of scapula
Term
what enervates the trapezius
Definition
ventral ramii of C3 and C4, but mostly by spinal accessory nerve
Term
What is the function of the trapezius
Definition
bends the head right or left and extends the head backward. also involved in the adduction and abduction of scapula
Term
T/F: the latissmus dorsi is an extrinsic and superficial back muscle
Definition
true
Term
What are the origins of the latissmus dorsi
Definition
iliac crest, thoracolumbar fascia, lower four ribs, and the spinous processes of T7-T12
Term
what is the insertion of the latissmus dorsi
Definition
intertuburcular groove of the humerous
Term
What enervates the latissmus dorsi
Definition
the thoracodorsal nerve
Term
What is the latissmus dorsi responsible for
Definition
extension, adduction, and rotation of the humerus
Term
T/F the levator scapulae muscle is extrinsic and superficial
Definition
True
Term
What enervates the levator scapulae muscle
Definition
the dorsoscapular nerve
Term
what is the function of the levator scapulae muscle
Definition
elevates the scapula
Term
What are the rhomboid major and minor muscles considered to be? (extrinsic or intrinsic)
Definition
extrinsic
Term
Are the rhomboid major/minor muscles superficial?
Definition
yes
Term
What enervates the rhomboid major/minor muscles
Definition
the dorsoscapular nerve
Term
What is the function of the rhomboid major/minor
Definition
adducts and rotates the scapula
Term
What is the physical description of the serratus posterior superior
Definition
extrinsic, intermediate muscle
Term
what enervates the serratus posterior superior
Definition
intercostal nerves T1-T4
Term
What does the serratus posterior superior do?
Definition
involved with respiratory activity
Term
What is the physical description fo the serratus posterior inferior
Definition
extrensic and intermediate
Term
What enervates the serratus posterior inferior
Definition
T10-T12 intercostal nerves
Term
What is the function of the serratus posterior inferior?
Definition
functions in respiration
Term
What is the physical description of the splenius capitis and slplenius cervices
Definition
intrinsic and deep back muscles
Term
what enervates the splenius capitis/cervices
Definition
the dorsal ramii fo the cervical spinal C1-C7 intercostal nerves
Term
What is the function of the splenius capitis/cervices
Definition
laterally bends the head, also extends the head
Term
What are the Erector Spinae Muscles
Definition
spinalis, longissimus, iliocostalis
Term
What is the classification of the erector spinae muscles
Definition
intrinsic and deep
Term
What enervates the erector spinae muscles
Definition
dorsal ramii of intercostal nerves
Term
What is the function of the erector spinae muscle
Definition
extends the spine when working bilaterally
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