Muscles of the Back

Question 0

Intermediate Muscles of the Back (3)

Answer 0

1. Levatores Costarum
2. Serratus Posterior Superior
3. Serratus Posterior Inferior

• RESPIRATION

Question 1

Superficial Muscles of the Back (5)

Answer 1

1. Trapezius
2. Latissimus Dorsi
3. Levator Scapulae
4. Rhomboid Minor
5. Romboid Major

*insert to bones of upper extremity

Question 2

Deep Muscles of the Back (7)

Answer 2

1. Splenius
2. Erector Spinae (LIS)
   
   • Iliocostalis
   • Longissimus
   • Spinalis
3. Transversospinalis (MRS)
   
   • Semispinalis
   • Multifidus
   • Rotatores

• Movements of trunk and back
• MRS LISS

Question 3

Trapezius

Answer 3

Origin: Skull - External occipital protuberance
Fascia - ligamentum nuchae
Vertebrae - spines of C7, T1-12
Insertion: Clavicle - lateral 1/3
Scapula - acromion and spine
Action: Both elevates (upper fibers) and depresses (lower fibers) shoulder; retracts scapula, extends head
Nerve: Accessory nerve (cranial nerve XI)

Question 4

Latissimus Dorsi

Answer 4

Origin: Vertebrae - spines of T6-12
Fascia - thoracolumbar fascia
Pelvic Bone - Iliac Crest
Insertion: humerus - intertubercular (bicipital) groove
Action: adducts, extends, and medially rotates arm
Nerve: Thoracodorsal nerve

Question 5

Levator Scapulae

Answer 5

Origin: Vertebrae - transverse processes of C1-C4
Insertion: Scapula - superior angle and medial border
Action: Elevates and adducts scapula
Nerve: Dorsal Scapular Nerve

Question 6

Rhomboid Minor

Answer 6

Origin: Vertebrae - spines of C7,T1
Insertion: Scapula - medial border
Action: elevates and adducts scapula
Nerve: Dorsal Scapular Nerve

Question 7

Rhomboid Major

Answer 7

Origin: Vertebrae - spines T2-T5
Insertion: Scapula - medial border to inferior angle
Action: Elevates and adducts scapula
Nerve: Dorsal Scapular Nerve

Question 8

Levatores Costarum

Answer 8

Origin: Vertebrae - transverse processes of C7, T1-11
Insertion: ribs - inferior to origin
Action: Raise ribs in inspiration
Nerve: dorsal rami of thoracic spinal nerves

Question 9

Serratus Posterior Superior

Answer 9

Origin: Vertebrae - spines of cervical and upper thoracic vertebrae
Insertion: ribs
Action: raise ribs in inspiration
Nerve: Intercostal Nerves

Question 10

Serratus Posterior Inferior

Answer 10

Origin: Vertebrae - spines of upper lumbar and lower thoracic vertebrae
Insertion: Ribs
Action: Lower ribs in expiration
Nerve: Intercostal nerves

Question 11

Splenius

Answer 11

Origin: vertebrae - spines of T1-T4
Insertion: splenius capitis to skull - occipital and temporal bones; splenius cervicis to vertebrae - transverse processes of C2-C3
Action: extend neck and head (rotate in unilateral action)
Nerve: dorsal rami of spinal nerves

*often fused to one another

Question 12

Iliocostalis (erector spinae)

Answer 12

Origin: Ilium and Ribs
Insertion: Ribs and transverse processes
Action: extend trunk and vertebral column
Nerve: dorsal rami of spinal nerves

Question 13

Longissimus (erector spinae)

Answer 13

Origin: transverse processes of vertebrae
Insertion: transverse processes of vertebrae
Action: extend trunk and vertebral column
Nerve: dorsal rami of spinal nerves

Question 14

Spinalis (erector spinae)

Answer 14

Origin: spinous processes
Insertion: spinous processes
Action: extend trunk and vertebral column
Nerve: dorsal rami of spinal nerves

Question 15

Semispinalis (transversospinalis)

Answer 15

Origin: transverse processes of vertebrae
Insertion: spines of vertebrae superior to origin (extend across 5 or 6 vertebrae)
Action: all extend trunk in bilateral action and rotate vertebral column in unilateral action
Nerve: dorsal rami of spinal nerves

Question 16

Multifidus (transversospinalis)

Answer 16

Origin: transverse processes of vertebrae
Insertion: spines of vertebrae superior to origin (extends across 3 or 4 vertebrae)
Action: all extend trunk in bilateral action and rotate vertebral column in unilateral action
Nerve: dorsal rami of spinal nerves

Question 17

Rotatores (transversospinalis)

Answer 17

Origin: transverse processes of vertebrae
Insertion: spines of vertebrae superior to origin (extend across 1 or 2 vertebrae)
Action: all extend trunk in bilateral action and rotate vertebral column in unilateral action
Nerve: dorsal rami of spinal nerves