Lecture 4: Thorax Muscles

Question 1

name of the superficial muscles of the back

Answer 1

1. Serratus posterior
2. latissimus dorsi
3. trapezius

Question 2

name of the deep muscles of the back

Answer 2

1. rotatores
2. multifidus
3. semispinalis

Question 3

name of the intermediate muscles of the back

Answer 3

1. spinalis
2. longissimus
3. iliocostalis

Question 4

shoulders 3 articulations

Answer 4

1. sternoclavicular joint
2. acromioclavicular joint
3. glenohumeral joint

Question 5

Physiological coupling of the shoulder

Answer 5

scapulo-thoracic joint
- couples the scapula to the thoracic cage involving subscapularis muscle sliding over the serratus anterior muscle

Question 6

Superior Trapezius OIA

Answer 6

O: superior nuchal line & external occcipital protuberance
I: lateral third of the scapula
A: elevates the scapula

Question 7

Middle trapezius

Answer 7

O: spinous processes of T1-T4
I: spine and acromion of scapula

Question 8

Inferior Trapezius

Answer 8

O: spinous processes T5-T12
I: spine of the scapula
A: depresses the scapula

Question 9

Latissimus Dorsi

Answer 9

O: Spinous processes of T7-T12, Iliac crest, Ribs 9-12, and the inferior angle of the scapula

I: all parts inster on the medial bicepital groove of the humerus

A: adducts/medially rotates the humerus at GHJ, extends the humerus at GHJ

Question 10

Levator Scapulae

Answer 10

O: transverse processes of C1-C4
I: medial border of the scapula
A: elevates the medial border of the scapula/flexes the neck laterally

Question 11

Rhomboid Major

Answer 11

O: dorsal spinous processes of the T2-T5 veretbrae

I: medial border of the scapula

A: retract/elevate the medial border of the scapula

Question 12

Rhomboid Minor

Answer 12

O: dorsal spinous processes of C6-C7 vertebrae

I: medial border of the scapula

A: retract/elevate the medial border of the scapula

Question 13

Serratus posterior superior

Answer 13

O: spinous processes of C7-T3

I: upper borders of ribs 2-5

A: elevates ribs

Question 14

Serratus posterior inferior

Answer 14

O: spinous processes of T11-L2

I: inferior borders of ribs 9-12

A: depresses ribs

Question 15

Pec Major

Answer 15

Clavicular part originates at the medial half of the clavicle

Sternocostal part originates at the sternum and cartilages of ribs 2-7

I: anteriorly & laterally at the Bicepital groove

A: clavicular part flexes arm at GHJ, sternocostal part extends arm at GHJ, together they medially rotate/adduct the arm

Question 16

Pec Minor

Answer 16

O: body of rib 3-5
I: coracoid process of the scapula
A: depresses and protracts the scapula

Question 17

Serratus anterior

Answer 17

O: body of ribs 1-9
I: medial border of the scapula
A: rotates the scapula, stabalizes the scapula