shoulder girdle muscles

Question 1

what boney landmark is located at the circle, and the line

Answer 1

• EOP - External Occiptial Protuberance
• SNL - Superior Nuchal Line

Question 2

label the ligament - what motion does it limit, what is the origin and insertion?

Answer 2

• nuchal ligament
• starts at EOP, then inserts on each spinous process (C1-C7)
• limits flexion of the cervical spine
• becomes continous with supraspinous ligament

Question 3

identify the muscle, origin, insertion, and 3 functional groups

Answer 3

• trapezius
• origin: EOP, SNL, nuchal line, each spinous process T1-T12
• insertion: superior lateral third of clavicle, superior acromion process, superior spine of scapula
• groups: Upper fibres of trapezius (UFT), Middle fibres of trapezius (MFT), Lower fibres of trapezius (LFT)

Question 4

UFT - origin, insertion, movement

Answer 4

• Upper Fibres of Trapezius - descending fibres
• origin: EOP, SNL, spinous process C1-C7
• insertion: lateral third of clavicle
• movement: elevation

Question 5

MFT - origin, insertion, movement

Answer 5

• Middle Fibres of Trapezius
• origin: spinous process T1-T3
• insertion: superior acromion process
• movement: retraction

Question 6

LFT - origin, insertion, movement

Answer 6

• Lower Fibres of Trapezius - Descending fibres
• orign: spinous process of T4-T12
• insertion: superior scapular spine
• movement: superior rotation of scapula, depression, posterior tilt of scapula

Question 7

identify the muscle, origin, insertion, and movement

Answer 7

• levator scapula
• origin: cervical spine - transverse process of C1-C4
• insertion: superior angle of scapula, medial boarder of scapula superior to scapular spine
• movement: inferior rotation of scapula

Question 8

identify muscle 1, origin, insertion, and movement

Answer 8

• rhomboid minor
• origin: spinous process of C7-T1
• insertion: medial boarder of scapula, root of scapular spine
• movement: retraction of shoulder girdle, inferior rotation of the scapula

Question 9

indientify muscle 2, origin, insertion, and movement

Answer 9

• rhomboid major
• origin: spinous process of T2-T5
• insertion: medial boarder of scapula, distal to the spine of scapula
• movement: retraction of the shoulder girdle, inferior rotation of the scapula

Question 10

identify the muscle, origin, insertion, and movement

Answer 10

• serratus anterior
• origin: later aspect of each upper 8 ribs
• insertion: length of medial boarder of scapula
• movement: protraction of the shoulder girdle, superior rotation of the scapula

Question 11

identify the muscle, origin, insertion, and movement

Answer 11

• pectoralis minor
• origin: anterior aspect of ribs 3-5
• insertion: medial side of coracoid porcess
• movement: protraction of shoulder girdle, depression of the shoulder girdle, anterior tilt of scapula

Question 12

which muscles manage the winging of the scapula?

Answer 12

serratus anterior, rhomboid major, rhomboid minor

(lower trapezius helps to limit it)