Lab 1- Back Muscles

latissimus dorsi location

most superficial; lower back

trapezius location

most superficial; upper back

sections of trapezius

1. superior

2. middle

3. inferior

movements of trapezius(all)

• retraction of scapula

• superior rotation of scapula

inferior head of trapezius movements

depression of scapula

superior head of trapezius movements

elevation of scapula

rhomboid location

located under the trapezius

sections of rhomboid

major and minor

rhomboid major and minor movements

retraction of the scapula

levator scapulae location

underneath rhomboid, along side of neck; superior angle of scapula

levator scapulae movements

• elevation of the scapula

• inferior rotation of the scapula

sections of serratus

1. posterior superior

2. anterior

3. posterior inferior

serratus posterior superior location

underneath rhomboids

serratus posterior superior movements

• elevation of ribs

• acts as accessory respiratory muscles

serratus anterior location

deep surface of scapula, wraps around ribcage

serratus anterior movements

protraction of the scapula

serratus posterior inferior location

underneath latissimus dorsi

serratus posterior inferior movement

depression of ribs

splenius cervicis and splenius capitis general location

underneath serratus posterior superior

splenius cervicis location/controls movement of

more towards the neck, neck movement

splenius capitis location/controls movement of

more towards the head, head movement

splenius cervicis and splenius capitis bilateral movement

extension and hyperextension of the head

splenius capitis unilateral movement

• lateral flexion of the head

• lateral same side rotation of the head

splenius cervicis unilateral movement

• lateral flexion of the neck

• lateral same side rotation of the neck

erector spinae muscles, from medial to lateral

1. spinalis

2. longissimus

3. iliocostalis

bilateral movements of erector spinae muscles

extension and hyperextension of the spine

unilateral movements of spinae muscles; movement they CAN all perform

lateral flexion of the spine

unilateral movements of spinae muscles, movement they CANNOT all perform

same side lateral rotation of the spine, longissimus and iliocostalis can do this, NOT spinalis

deep spinal stabilizers, from most superficial/largest to deep/smallest

1. semispinalis

2. multifidus

3. rotatores(don’t need to remember this one)

spinal stabilizers bilateral movements

extension and hyperextension of the spine

spinal stabilizers unilateral movements, can they all do this?

• lateral flexion of the spine

• opposite-side lateral rotation of the spine

can all perform these movements

what are accessory respiratory muscles

serratus posterior superior and serratus posterior inferior