Superficial Back Muscles Flashcards
Trapezius
Origin
- External occipital protuberance
- superior nuchal line
- ligamentum nuchae
- spinous processes of C7-T12
Trapezius
insertion
- acromion
- spine of scapula
- lat 1\3 of clavicle
Trapezius
innvervation
- accessory nn CN XI (motor)
- Cervical nn. (C3 and C4); (proprioception
Trapezius
blood
-branches of transverse cervical a.
Trapezius
action
- elevates
- retracts
- rotates scapula
Latissimus Dorsi
origin
- thoracolumbar aponuerosis
- spinous process T6-T12
- iliac crest
- ribs X-XII
Latissimus Dorsi
insertion
-floor of intertubercular groove of humerus
Latissimus Dorsi
innervation
-thoracodorsal nn (C6, C7, C8)
Latissimus Dorsi
Blood
-thoracodorsal aa. (branch of subscapular aa.)
Latissimus Dorsi
action
- Extends
- adducts
- medially rotates humerus
- holds body when climbing
Levator Scapulae
origin
-posterior tubercles of the transverse processes of C1-C4
Levator Scapulae
Insertion
upper portion of medial border of scapula
Levator scapulae
innvervation
- Dorsal scapular n. (C5)
- Cervical nn C3 and C4
Levator scapulae
blood
dorsal scapular a.
Levator scapulae
action
- elevates scapula
- tilts glenoid cavity inferiorly by rotating scapula
Rhomboideus Major and Minor
origin
Major: Spinous processes T2-T5
Minor: Spinous processes C7-T1
Rhomoideus Major and Minor
insertion
Medial border of scapula from above scapular spine to inferior angle.
-minor is cranial to major
Rhomboideus Major and Minor
Innvervation
Dorsal scapular nn.
Rhomboideus Major and Minor
Blood
Dorsal scapular a.
Rhomboideus Major and Minor
action
Retracts scapula and elevates it (trapezius has same functions)
Intermediate muscles of the back
- posterior serratus sup.
- post. serratus inf
Function of intermediate muscles of back?
minor muscles of respiration
Deep (True/Intrinsic) muscles of the back?
Erector spinae group of muscles:
- spinalis
- longissimus
- illiocostalis
What fascia encloses the erector spinae muscle group?
- thorcolumbar fascia (has anterior and posterior laminae)
Erector spinae muscle group
origin
- sacrum
- spinous processes of lower thoracic and lumbar vertebrae.
Iliocostalis
insertion
angles of ribs
Longissimus
insertion
transverse processes of vertebrae
Spinalis
insertion
interconnect spinous processes of adjacent vertebrae
Innvervation of erector spinae muscles
Dorsal primary rami
(erector spinae group are the only back muscles innervated my dorsal primary rami, the rest innervated by ventral primary rami).
Number of bones in vertebral column
33
Number of vertebrae in cervical region of vertebral column?
7
Number of vertebrae in thoracic region?
12
Number of vertebrae in lumbar region?
5
Number of vertebrae in sacral region?
5
Number of vertebrae in coccygeal region?
4
Convex curvature of spine (forward)?
Cervical and Lumbar (secondary)
Concave curvature of spine (forward)?
thoracic and sacral (primary)
What are the 2 primary curvatures present at birth?
Thoracic and Sacral (concave forward)
What are the 2 secondary curvatures that develop later?
Cervical and Lumbar (convex forward)
