Week 5: Vertebral Column I Flashcards
1
Q
- How are the intrinsic and extrinsic back muscles differentiated?
- What are the superficial and intermediate back muscles?
- What do these groups control with respect to motion of the body?
A
- The superficial and intermediate muscles do not develop in the back, and are classified as extrinsic muscles.
- The deep muscles develop embryologically in the back, and are thus described as intrinsic muscles.
SUPERFICIAL
- Attach to the bones of the shoulder – the clavicle, scapula and humerus.*
- All these muscles are therefore associated with movements of the upper limb.*
- Trapezius.
- Latissimus dorsi.
- Levator scapulae.
- Rhomboid minor.
- Rhomboid major.
INTERMEDIATE
These muscles run from the vertebral column to the ribcage, and assist with elevating and depressing the ribs. They are thought to have a slight respiratory function.
- Serratus posterior superior.
- Serratus posterior inferior.
2
Q
- What are the intrinsic back muscles associated with?
- What are the two superficial intrinsic back muscles?
- What are the three intermediate intrinsic back muscles?
- Collectively, these three muscles form a column. What is this column called?
- What are the three deep intrinsic back muscles?
A
- They are associated with the movements of the vertebral column, and the control of posture.
- Splenius capitis and splenius cervicis.
- The iliocostalis, longissimus and spinalis.
- Together these muscles form a column, known as the erector spinae.
- Semispinalis, multifidus and rotatores.
3
Q
Identify these extrinsic back muscles.
A
4
Q
Identify these two muscles.
A
5
Q
- What three muscles make up the erector spinae group?
- What is the function of the erector spinae group?
A
- Iliocostalis.
- Longissimus.
- Spinalis.
- Straighten and rotate the spine.
6
Q
- What are the three major muscles of the transversospinalis group?
A
- Rotatores.
- Multifidus.
- Semispinalis.
