Back_muscles_FCs

Question 1

What are 3 layers of the back?

Answer 1

1) Superficial, 2) Intermediate, 3) Deep Layer

Question 2

What is general action of Superficial Layer of Back?

Answer 2

Move arms

Question 3

What is general actions of intermediate layer?

Answer 3

they are respiratory muscles

Question 4

What is the general action of Deep layer back muscles

Answer 4

they move the trunk and back

Question 5

How are upper arms attached to vertebrae?

Answer 5

Muscle

Question 6

To which three bones of upper extremity to superficial muscles attach? What is the common function of these bones?

Answer 6

Clavicle, scapula, Humerus allow for freedom of movement of upper extremity

Question 7

What are the 3 attachment sites of Arm and Body?

Answer 7

1) Scapula–Muscle–Vertebrae 2)clavicle = bony link 3) Scapula + humerus via glenohumorial joint (ball and socket)

Question 8

What are the landmark attachment points for Scapula?

Answer 8

Superior Angle, Coracoid process, Acromion, Glenoid Fossa, Inerior Angle

Question 9

What are the muscles of the Superficial Group?

Answer 9

Trapezius, Latissimus Dorsi, Levator Scapulae, Rhmoinds Major and Minor

Question 11

Which Fascia covers the DEEP Muscles of the Back? What are it’s attachment sites and function?

Answer 11

Thoracolumbar Fascia- attaches medially to spines of vertebrae and inferiorily to ilium; provides attachment sites for muscle

Question 12

What are the borders of the Triangle of Asculatation?

Answer 12

Medial to scapula, overlies 6th intercostal space; ; Boundaries: inf- Lat. Dorsi, Sup- Trapezius, Lat- Rhomboid major

Question 13

What is the clinical Significance of the Triangle of Asculation?

Answer 13

Good place to listen w/ stethoscope

Question 14

What are the muscles of the Intermediate muscle group?

Answer 14

Levatores costarum, serratus posterior superior, serratus posterior

Question 15

In which direction do ribs move during Inspiration?

Answer 15

Lifting ribs–> expands thorax–> inspiration

Question 17

What are the muscles of the DEEP Back Muscles?

Answer 17

Splenius, Erector spinae, Transversospinalis

Question 19

What are the 4 possible movements of the vertebral column?

Answer 19

Extension, flexion, rotation, lateral flexion

Question 20

Describe how nerve organization changes as they leave spinal cord

Answer 20

Spinal nerves divide into Dorsal and Ventral RAMI when they leave Intervertebral Doramen

Question 21

Describe innervation of Dorsal Ramus

Answer 21

Sensory + Motor neurons to back; SENSORY–> Skin of back/pos. neck; MOTOR axons to DEEP muscls of back and neck

Question 22

Describe innervatinon of Ventral Ramus

Answer 22

Sensory + Motor Neurons to other parts; SENSORY–> skin of extremities and ant./lat trunk; MOTOR–> muscles of extremities and ant./lat trunk

Question 23

Describe innervation of dermatomes

Answer 23

One SENSORY nerve innervates one dermatome (strip of skin); many form coninuous regions; Ventral Rami make up most

Question 24

What is unique about the orientation of the muscle fibers of transversospinalis and erector spinae muscles?

Answer 24

Transversospinales= angled up and in toward spines; erector spinae= parallel to vertebral column