DR1. Back and Shoulder Flashcards
Where do the superficial muscles of the back attach
- The superficial muscles of the back attach the pectoral girdle to the trunk
Upper fibres of trapezius - origin
- From external occipital protuberance of the skull and from the spinous processes of the cervical vertebrae
Upper fibres of trapezius - insertion
- Insert into the clavicle, acromion and the spine of the scapula
Middle fibres of the trapezius - origin
- Spinous processes of the upper thoracic vertebrae
Middle fibres of the trapezius - insertion
- Spine of the scapula
Lower fibres of the trapezius - origin
- Spinous processes of the lower thoracic vertebrae
Lower fibres of the trapezius - insertion
- Spine of the scapula
Major and minor rhomboid muscles - origin
- Have an origin from the spinous processes of the C7 and the upper 5 thoracic vertebrae
Major and minor rhomboid muscles - insertion
- Medial border of the scapula
Latissimus dorsi muscle - origin
- Thoracolumbar fascia of the back
Latissimus dorsi muscle - insertion
- Floor of the intertubercular sulcus (or bicipital groove) of the humerus
Serratus anterior - origin
- Originates as a series of individual slips from the upper eight ribs
Serratus anterior - insertion
- Along the medial border of the scapula
Immediate superficial back muscles
- Serratus posterior superior and inferior
Serratus posterior superior and inferior - function
- These are accessory respiratory muscles that help expand the chest cavity during inspiration
Where are the deep intrinsic muscles of the back seen
- Seen within the groove between the spinous processes of the vertebrae and angle of the ribs
Largest group of deep back muscles
Erector spinae muscles (medial to lateral)
- Spinalis
- Longissimus
- Iliocostalis
Erector spinae muscles - origin
- Erector spinae aponeurosis
- This is a broad thick tendon at the base of the back
Where do the three parts of erector spinae muscles run
- The three parts of erector spinae all run superiorly from the erector spinae aponeurosis
Spinalis - insertion
- Thoracic spinous processes and skull
Longissimus - insertion
- Mainly inserts into the thoracic and cervical transverse processes
Iliocostalis - insertion
- Ribs
Muscle that appears upon reflection of erector spinae muscles
- Multifidus
Multifidus - origin
- Runs superiorly from transverse processes which is its origin
Multifidus - insertion
- Spinous processes
Where is multifidus thickest
- Lumbar region
Purpose of multifidus
- Major stabiliser of the back, as well as extends the vertebral column
What does the pectoral girdle support
- Is the bony skeleton that supports the upper limb