Week 2 Flashcards
Nerve Supply
MUSCLE: SPINAL NERVE:
External Oblique T8-12, L1
Internal Oblique T8-12, L1
Transverse Abdominis T8-12, L1
Rectus Abdominis T7-12
Quadratus Lumborum T12-L1/3
Erector Spinae Adjacent spinal nerves
Multifidus Adjacent spinal nerves
Anterolateral Abdominal wall
STRUCTURE: Bilaterally paired muscles in the anterolateral abdominal wall
- -> 3 flat muscles :
1: External oblique
2: Internal oblique
3: Transverse abdominis - -> 1 vertical muscle
1: Rectus abdominis
Anterolateral Abdominal wall- External Oblique
- most superficial of the 3 lateral muscles
- ORIGIN: Borders of lower 8 ribs
- INTERSECTION: lilac crest, abdominal aponeurosis, linea alba
- ACTION: compresses abdomen, lumbar flection & posterior pelvic rotation, laterally flexes vertebral column, conterlateral rotator of the trunk
Anterolateral Abdominal wall- Internal Oblique
- Middle layer of lateral abdominal muscles
- ORIGIN: inguinal ligament, thoracolumbar fascia, lilac crest
- INTERSECTION: Costal cartilage of ribs 8, 9, 10 and line alba
- ACTION: stabilisation of spine, lumbar flexion & posterior pelvic rotation, laterally flexes vertebral column, lpislateral rotator of trunk
Anterolateral Abdominal wall- Transverse Adbominis
- Deepest of the lateral abdominal muscles
- ORIGIN: inhuinal ligament (lateral 1/3), lilac crest, lumbar fascia, inner surface of costal cartilage ribs 6-12
- ACTION: compresses the abdominal, stiffens intervertabral segments via fascia, stabilises spine, modulates activity with breathing, becomes active prior to limb movement
Rectus Abdominis (RA)
- Runs from pelvis to ribs to sternum
- RA & lateral fivers of the EO prime movers of trunk flexion
- Mobilises
- Better set up for rapid ballistic movements
- Extensive nerve supply
- Performs multiple functions at once
- ## Can separate lower and upper abdomen by nerve supply
Concentric Vs Eccentric
Concentric: Bicep shortens while contracting
Eccentric: Bicep muscle is lengthening while contracting
Pectoral (shoulder) Gridle
Includes: clavicle & scapular Functions: -position shoulder joint - help move upper limb - provide base for muscle attachment
Clavicle
Articulation points:
- Scomial end (Acromioclavicular joint)
- Sternal end (Sternoclavicular joint)
- S-curve shaped bone: medially convex anteriorly, laterally concave anteriorly
- Costal tuberosity
- Conoid tubercle
Scapula
Articulation:
- Head of the humerus at the glenoid fossa (glenohumeral shoulder joint)
- Clavical at the acromion process (Acromioclavical joint)
- Coracoid process
- Spine of scapular
- Borders
- Angles
- Fossae - muscle
Upper limb
- Humerus
- Radius
- Ulna
- Carples
- Metercarples
- Phalanges
Humerus
Articulation points:
- Head
- Capitulum meets radius
- Trochlea meets ulna
Muscle attachment sites:
- Greater & lesser tubercles
- Deltoid tuberosity
- Lateral & Medial epicondyle
Ulna
- Olecranon: hook like projection
- Trochlear notch with cartilage (medial part of elbow)
- Coronoid process anterior: brachialis
- Shaft with lateral interosseous border (interosseous membrane)
- Distal with head
Radius
- Lateral bone of forearm
- Proximal disc like head articulates with:
1. Ulna: radial notch (superior radioulnar joint)
2. Humerus: captiulum (elbow joint) - Shaft: radial tuberosity (biceps brachii
- Expanded distal end with:
- -Radial styloid process laterally
- Ulnar notch medially (inferior radioulnar joint)
- Articulates scaphoid & lunate (radiocarpal joint)
Carpal Bones
8 short bones of the wrist Arranged in 2 rows between forearm and wrist --PROXIMAL ROW (L-M) -Scaphoid -Lunate -Triquetrum -Pisiform (sesemoid bone)
- -DISTAL ROW (L-M)
- Trapezium
- Trapezoid
- Capitate
- Hamate
