Quiz 1- Back Muscles Flashcards Preview

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Flashcards in Quiz 1- Back Muscles Deck (20):
1

Trapezius

ORIGIN: Medial part of the superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous process of C7-T12
INSERTION: Lateral third of the clavicle, Acromion, spine of scapula
FUNCTION: Elevates, depresses, and retracts (Movement of the Upper Limb)
NERVE: Accessory Nerve (CN XI) and C3, C4 Spinal nerves
BLOOD SUPPLY: Transverse Cervical Artery

2

Latissimus Dorsi

ORIGIN: Thoracolumbar Fascia (Spinous processes of T7 through Ilium), Iliac Crest, and Inferior 3-4 Ribs
INSERTION: Floor of inter tubercular sulcus of humerus (Near the head of the humerus)
FUNCTION: Extends, Adducts, and Medially rotates humerus (Elevates trunks to the arms- climbing- LAT Pull)
NERVE: Thoracodorsal Nerve (Posterior Brachial Plexus)
BLOOD SUPPLY: Thoracodorsal Artery

3

Rhomboid Major

ORIGIN: Spinous processes of T2-T5
INSERTION: Medial border of scapula (Between scapular spine and inferior angle)
FUNCTION: Adducts scapula by pulling it towards vertebral column. Rotates scapula
NERVE: Dorsal Scapular Nerve (C5)
BLOOD SUPPLY: Transverse cervical/Dorsal Scapular Artery

4

Rhomboid Minor

ORIGIN: Nuchal LIgament and Spinous processes of C7-T1
INSERTION: Medial border of the Scapula
FUNCTION: Assists rhomboid major muscle
NERVE: Dorsal Scapular Nerve (C5)
BLOOD SUPPLY: Transverse cervical/Dorsal scapular Artery

5

Lavator Scapulae

ORIGIN: Transverse processes of atlas, axis, C3, C4
INSERTION: Superior angle and upper medial border of scapula
FUNCTION: Elevates superior border of scapula, rotated scapula laterally
NERVE: Cervical (C3, C4) and Dorsal Scapular (C4, C5) Nerves
BLOOD SUPPLY: Transverse Cervical Artery

6

Serratus Posterior Superior

ORIGIN: Spinous Processes of C7-T3
INSERTION: Upper border of ribs 2, 3, 4, 5
FUNCTION: Elevates Ribs 2-5 (Respiratory Aid)
NERVE: Ventral Rami of T1-T4
BLOOD SUPPLY:--

7

Serratus Posterior Inferior

ORIGIN: Spinous processes of T11-L3
INSERTION: Lower border of Ribs 9, 10, 11, 12
FUNCTION: Draws back Ribs 9-12
NERVE: Ventral Rami of T9-T12

8

Splenius Cervicus

ORIGIN: Spinous Process T3-T6
INSERTION: Tubercles of transverse processes of C1-C3 or C4 vertebrae
FUNCTION: Bilaterally extend head and neck. It also unilaterally rotates and laterally bends head and neck.
NERVE: Dorsal rami of spinal nerves
BLOOD SUPPLY: Muscular branches of the aorta

9

Splenius Capitis

ORIGIN: Spinous processes of C7-T4 vertebrae
INSERTION: Fibers run superolaterally to mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone
FUNCTION: Bilaterally extends head and neck. It also unilaterally rotates and laterally bends the head and neck.
NERVE: Dorsal rami of spinal nerves
BLOOD SUPPLY: Muscular branches of the aorta

10

Spinalis

ORIGIN: Spinous processes of C6-L2
INSERTION: Spinous processes of C2-T8 (most superior insertion to the superior nuchal line)
FUNCTION:
NERVE: Dorsal Rami of cervical/thoracic spinal nerves
BLOOD SUPPLY: Muscular branch of aorta

11

Longissimus

ORIGIN: Transverse processes of T8-L5
INSERTION: From mastoid processes to transverse processes of all thoracic vertebrae. Also fibers run superiorly to ribs in between tubercles.
FUNCTION: Extends and Laterally flexes vertebral column
NERVE: Dorsal rami of cervical/thoracic/lumbar spinal nerves
BLOOD SUPPLY: Muscular branch of aorta

12

Iliocastalis

ORIGIN: Sacrum and the Iliac Crest
INSERTION: Fibers run superiorly to angles of lower ribs and cervical transverse processes.
FUNCTION: Extends, Laterally Flexes, and Assists in Rotation of Vertebrae
BLOOD SUPPLY: Muscular branch of aorta

13

Semispinalis

ORIGIN: Transverse processes of C4-T12 vertebrae
INSERTION: Fibers run superomedially to occipital bone and spinous processes superiorly by 4-6 segments
FUNCTION Extends vertebral column, rotates it to the opposite side
NERVE: Dorsal rami of spinal nerves
BLOOD SUPPLY: Muscular branch of aorta

14

Semispinalis Capitis

ORIGIN: Transverse processes of C7-T7
INSERTION: Between superior and inferior nuchal lines on the occipitum
FUNCTION: Extends the head and rotates it to the opposite side.
NERVE: Dorsal rami of cervical nerves (also the greater occipital nerves)
BLOOD SUPPLY: Muscular branch of the aorta

15

Multifidus

ORIGIN: Articular processes of cervical vertebra to lower dorsal sacrum
INSERTION: Spinous processes of vertebrae superiorly by 2-4 vertebrae
FUNCTION: Stabilizes vertebrae during local movements of vertebral column
NERVE: Dorsal rami of spinal nerves
BLOOD SUPPLY: Muscular branch of aorta

16

Rotatores

ORIGIN: Transverse process of one vertebrae
INSERTION: To the base of spinous process of the vertebra immediately (brevis) or 2 segments (longus) superiorly
FUNCTION: Rotate to the opposite side; Bilateral extension
NERVE:--
BLOOD SUPPLY: Muscular branch of aorta

17

Rectus Capitis Posterior Major

ORIGIN: Spinous process of vertebra C2
INSERTION: Lateral part of inferior nuchal line of occipital bone
FUNCTION: Extension of the neck
NERVE: Suboccipital Nerve (posterior ramus of C1)
BLOOD SUPPLY: Vertebral Artery

18

Rectus Capitis Posterior Minor

ORIGIN: Posterior tubercle of posterior arch of vertebra C1 (Atlas)
INSERTION: Medial part of inferior nuchal line of occipital bone
FUNCTION: Extension of the neck
NERVE: Suboccipital nerve
BLOOD SUPPLY: Vertebral Artery

19

Obliquus Capitits Inferior

ORIGIN: Posterior tubercle of posterior arch of vertebra C2 (axis)
INSERTION: Transverse process of vertebra C1 (Atlas)
FUNCTION: NO ATTACHMENT TO HEAD- Mainly postural muscles
NERVE: Suboccipital nerve
BLOOD SUPPLY: Vertebral Artery

20

Obliquus Capitis Superior

ORIGIN: Transverse process of vertebra C1
INSERTION: Occipital bone between superior and inferior nuchal lines
FUNCTION: Extension and Lateral Flexion of the neck
NERVE: Suboccipital Nerve
BLOOD SUPPLY: Vertebral Artery