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Exam 2
Muscle origin insertions and actions
47
Anatomy
Undergraduate 1
10/31/2010

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Term
Eccentric
Definition
Produces a rotation and translation movement, Rotary component
Term
Centric
Definition
Non- rotary, produces linear motion
Term
Angle of pull
Definition
Direction of pull on a muscle related to the difference of eccentric and centric forces.
Term
Torque
Definition
F(rotary)x R(rotary)
Term
Mechanical Advantage
Definition
FA/RA
FA-Force Arm
RA- Resistance Arm
Term
Class 1 Lever
Definition
Force-Axis- Resistance
Like a seesaw
Term
Class 2 Levers
Definition
Axis- Resistance-Force
Term
Class 3 Levers
Definition
Axis-Force-Resistance
Term
Rotary
Definition
causes angular joint motion
Term
Non-Rotary
Definition
Can stabilize or destabilize
Stabilize- force directed towards axis
Destabilize- force directed away from axis
Term
Trapezius
Definition
O: Base of Skull, Spine C7-T12
I: Lateral Third of Clavicle, spine of scapula
Action: Elevation, depression, Adduction, Upward rotation
Term
Levator Scapulae
Definition
O: Vertabrae C1-4
I: Superior angle of Scapula
Action: Elevation
Term
Rhomboids
Definition
O: Spinous process Vertabrae C7,T1-5
I: Vertebral Border of scapula
Action: Adduction, Downward Rotation, Elevation
Term
Pectoralis Minor
Definition
O:Anterior surface of ribs 3-5
I: Coranoid Process
Action: depression, Abduction, Downward Rotation
Term
Serratus Anterior
Definition
O:Lateral surface of Ribs 1-9
I: Costal Surface of medial border of scapula
Action: Mainly upward rotation, Abduction
Term
Acromioclavicular Ligament
Definition
spans acromion process to clavicle
Term
Coracoclaviular Ligament
Definition
Conoid and Tapezoid ligaments, spans from clavicle to coranoid process
Term
Sternoclavicular
Definition
spans from clavicle to sternum
Term
Coracohumeral Ligament
Definition
coronoid process to greater tubercle
Term
glenohumeral Ligament
Definition
glenoid cavity to lesser tubercle
Term
transverse Ligament
Definition
narrow band connects to greater and lesser tubercle
Term
Rotator Cuff Muscles
Definition
Supraspinatus
Infraspinatus
Teres Minor
Subscapularis
Term
Supraspinatus
Definition
O: Medial 2/3 of supraspinous fossa
I: superiorly on greater tubercle
Action: abduction
Term
Infraspinatus
Definition
O:medial aspect of infraspinous fossa
I: posterior side of greater tubercle
Action: Horizontal Abduction, External Rotation
Term
Teres Minor
Definition
O: Lateral border of scapula (posterior)
I: Posterior side of Greater tubercle
Action: Horizontal Abduction, external rotation
Term
Subscapularis
Definition
O: Subascapular Fossa
I: Lesser tubercle
Action: Internal Rotation, Extentsion, adduction
Term
Teres Major
Definition
O: Inferior third of lateral border of scapula
I: medial lip of intertubercular groove
Action: Adduction, extension, internal rotation
Term
Pectoralis Major
Definition
O: Medial Third of anterior clavicle, Anterior surface of ribs 1-6 and sternum I: Lateral Intertubercular groove Action: Adduction, Horizontal adduction, internal rotation, flexion, extension from flexed postion
Term
Deltoid
Definition
O: Anterior/Lateral Clavicle, Acromion procces and spine of scapula
I: Deltoid tuberosity of humerous
Action: abduction, flexion, horizontal adduction, horizontal abduction, extention
Term
Latissumus Dorsi
Definition
O: Posterior Crest of ilium, Sacrum, spinous process of T6-T12& L1-5 and lower 3 ribs
I: medial lip of intertubercular groove
Action: adduction, extension, horizontal abduction, Internal rotation
Term
Coracobrachialis
Definition
O: coranoid process of scapula
I: middle of the medial borderof humeral shaft
Action: flexion, adduction, horizontal adduction
Term
Ulnar collateral ligament
Definition
prevents abduction on medial side
Term
Radial collateral Ligament
Definition
prevents adduction, lateral side
Term
Anular Ligament
Definition
keeps radius in contact with radial notch of ulna
Term
Biceps Brachii
Definition
O: Supragenoid tubercle, coracoid process
I: radial tuberosity
Action: Flexion, supination
Term
Brachialis
Definition
O: Distal Half of anterior humerous
I: coronoid process of ulna
Action: Flexion
Term
Brachioradialis
Definition
O:distal 2/3 of lateral supercondylar ridge
I: Lateral surface if radius at the styloid proccess
Action: flexion, pronation from supinated position, supination from pronated position
Term
Triceps Brachii
Definition
O: infraglenoid tubercle, upper 1/2 of posterior humerous, distal 2/3 of posterior humerous I: olecranon process Action: extension, adduction, horizontal abduction(at glenohumeral joint)
Term
Anconeus
Definition
O: posterior surface of lateral condyle
I: posterior 1/4 of ulna and lateral olecranon process
Action: extention, prenvents elbow from pinching triceps
Term
Pronator Teres
Definition
O: Distal part of medial supraconylar ridge and medial proximal ulna
I: middle 1/3 of lateral radius
Action: pronation of forearm
Term
Pronator Quadratus
Definition
O: Distal 1/4 of anterior ulna
I: Distal 1/4 of anterior radius
Action: Pronation of forearm
Term
supinator
Definition
O: lateral epicondyle of humerous and proximal posterior ulna
I: lateral surface of the proximal radius
Action: supination of forearm
Term
hand muscles
Definition
Anteromedial-flexion
Posterolateral- extension
Term
pollicus
Definition
thumb
Term
digitorum
Definition
fingers
Term
palmaris
Definition
palmar aspect of hand
Term
carpi
Definition
carpalmetacarpal attachment
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