Connects arm to thorax - Houston Community College
Transcript of Connects arm to thorax - Houston Community College
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⦿ Connects arm to thorax⦿ 3 joints
◼ Glenohumeral joint◼ Acromioclavicular joint◼ Sternoclavicular joint
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⦿ Scapula◼ Elevation◼ Depression◼ Protraction
(abduction)◼ Retraction
(adduction)◼ Downward Rotation◼ Upward Rotation
⦿ Arm (Shoulder Joint)◼ Flexion◼ Extension◼ Abduction◼ Adduction◼ Medial Rotation◼ Lateral Rotation
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⦿ Movement of shoulder can affect spine and rib cage◼ Flexion of arm Extension of spine◼ Extension of arm Flexion of spine◼ Adduction of arm Ipsilateral sidebending of
spine◼ Abduction of arm Contralateral sidebending
of spine
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⦿ Scapulae⦿ Clavicles⦿ Manubrium⦿ Provides mobile base for movement of arms
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⦿ Collarbone⦿ Elongated S shaped bone⦿ Articulates with Sternum through Manubrium⦿ Articulates with Scapula through Acromion⦿ Ligaments
◼ Costoclavicular - Anchor clavicle to 1st rib◼ Coracoclavicular - Anchor clavicle to scapula
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Sternoclavicular Joint
Saddle JointFlexion/ExtensionElevation/DepressionLimited Rotation
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⦿ Acromion articulates with clavicle⦿ Gliding joint – opens and closes angle
between scapula and clavicle⦿ Acromioclavicular ligament – where joint
capsule thickens on superior portion⦿ Coracoclavicular ligament offers main
support for joint
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Coracoclavicular ligamentAcromioclavicular
joint
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⦿ Ball and Socket Joint⦿ Glenoid cavity and head of humerus⦿ Primary joint of shoulder⦿ Mobile but unstable joint
◼ Head is 2-3X larger than cavity ◼ Cavity is shallow
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⦿ Attachments◼ Outer rim of glenoid cavity◼ Anatomical neck of humerus
⦿ Ligaments◼ Superior – Coracohumeral ligament
• Coracoid process to greater tubercle
◼ Anterior – 3 glenohumeral ligaments• Border of glenoid cavity to lesser tubercle and neck
⦿ Reinforced by tendons of rotator cuff⦿ Glenoid Labrum -
◼ fibrocartilaginous ring seals the joint
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⦿ Origin: Upper 8 or 9 ribs⦿ Insertion: Medial border of scapula⦿ Action:
◼ Fixes scapula in place◼ Abduction and upward rotation of scapula◼ Inspiration by elevation of ribs
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⦿ Origin: Ribs 3-5⦿ Insertion: Coracoid process⦿ Action:
◼ Pulls scapula down and forward◼ Assists inspiration by elevating ribs
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⦿ Origin: Rib 1 and cartilage⦿ Insertion: Underside of clavicle⦿ Action:
◼ Depresses clavicle
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⦿ Origin: Sternum and Clavicle⦿ Insertion: Mastoid Process⦿ Action:
◼ Elevates area where sternum and clavicle meet to assist inspiration
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⦿ Origin: Transverse process of C1-C4⦿ Insertion: Superior angle of scapula⦿ Action
◼ Elevation of scapula◼ Downward rotation of scapula
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⦿ Minor and Major⦿ Origin: Spinous process C7-T5⦿ Insertion: Medial border of scapula⦿ Action:
◼ Retraction of scapula◼ Downward rotation of scapula
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⦿ Origin: Occiput, nuchal ligament, spinous process of C7-T12
⦿ Insertion: ◼ Lateral 1/3 of clavicle (upper)◼ Acromion process and scapular spine (middle)◼ Trapezius tubercle and medial end of scapular spine
(lower)
⦿ Action:◼ Retraction of scapula (all 3)◼ Elevation, upward rotation of scapula, and elevation
of clavicle (upper)◼ Depression and upward rotation of scapula (lower)
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⦿ Subscapularis⦿ Supraspinatus⦿ Infraspinatus⦿ Teres Minor
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⦿ Origin: Anterior Surface of scapula⦿ Insertion: Lesser Tubercle of
humerus⦿ Action: ◼Medial rotation of arm◼Adduction of arm
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⦿ Origin: Supraspinous Fossa⦿ Insertion: Greater Tubercle⦿ Action: Abduction of arm
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⦿ Origin: Infraspinous Fossa⦿ Insertion: Greater Tubercle
below Supraspinatus⦿ Action: ◼Lateral Rotation of arm◼Abduction of arm
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⦿ Origin: Lateral Border of Scapula⦿ Insertion: Greater Tubercle
(below Infraspinatus)⦿ Action: Lateral Rotation of arm
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⦿ Origin: Coracoid Process⦿ Insertion: Medial Surface of
humeral shaft near middle⦿ Action: ◼Flexes arm◼Adducts Arm
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⦿ Origin: ◼ Shorthead – coracoid process◼ Longhead – tubercle above glenoid
cavity⦿ Insertion: Radial Tuberosity⦿ Action (of arm):
◼ Shorthead – adduction ◼ Longhead - abduction
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⦿ Origin: ◼ Clavicular head – Anterior and medial clavicle◼ Sternocostal head – Sternum and costal cartilage
⦿ Insertion: Lateral aspect of Bicipital groove⦿ Action:
◼ Both heads –Adduction and Medial rotation of arm◼ Clavicular head – flexes shoulder when it is
extended◼ Sternocostal head – extends shoulder when it is
flexed
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⦿ Origin: Sacral and Iliac Crest, Thoracolumbar fascia, spinous process of T7-T12, posterior surface of lower ribs
⦿ Insertion: Bicipital groove⦿ Action:
◼ Extension of arm◼ Adduction of arm◼ Medial rotation of arm
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⦿ Origin: posterior surface of inferior angle⦿ Insertion: Medial aspect of bicipital groove
next to latissimus dorsi⦿ Action:
◼ Extension of arm◼ Adduction of arm◼ Medial rotation of arm
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⦿ Origin: Scapular spine and acromion process of scapula, lateral 1/3 of clavicle
⦿ Insertion: Deltoid Tuberosity ⦿ Action:
◼ Abduction of arm◼ Anterior fibers – act in flexion and medial
rotation of arm◼ Posterior fibers – act in extension and lateral
rotation of arm
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⦿ Elbow – where ulna, radius and humerus meet
⦿ Forearm◼ 2 bones
• Radius - wrist• Ulna – elbow
⦿ Hinge Joint◼ Flexion and Extension
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Coronoid fossa
Olecranon fossa
Radial fossa
Lateral epicondyle Medial
epicondyle
CapitulumTrochlea
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⦿ Attachments:◼ Above radial and coronoid fossae◼ Above olecranon fossa◼ Neck of radius◼ Coronoid process ◼ Medial surface of ulna ◼ Olecranon
⦿ Loose in back to facilitate flexion⦿ Capsule encloses humeroulnar joint,
radiohumeral joint, and radioulnar joint
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⦿ Annular ligament◼ U-shaped – wraps around head of radius and
attaches to front and back of ulna◼ Surrounds and secures head and neck of radius
⦿ Radial collateral ligament◼ Lateral epicondyle and inserts on annular
ligament and lateral olecranon◼ Reinforces function of annular ligament
⦿ Ulnar collateral ligament◼ Medial epicondyle and attaches below medial
coronoid process and olecranon
⦿ Collaterals allow flexion and extension but prevent lateral movement of elbow
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⦿ Flexion – movement that decreases angle between anterior surfaces of arm and forearm◼ Active flexion – limited by contact between
bodies of muscles◼ Passive flexion – more range because muscles are
more compressible◼ Extreme flexion – radial head and coronoid
process fix against fossae
⦿ Extension – Return from flexion to anatomical position or an increase in the angle between arm and forearm◼ Olecranon fits against fossa
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⦿ Flexion◼ Brachialis◼ Brachioradialis◼ Biceps Brachii
⦿ Extension◼ Triceps brachii◼ Anconeus
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⦿ Origin: Anterior surface of distal humerus
⦿ Insertion: Coronoid process⦿ Action: Flexion of elbow
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⦿ Origin: Lateral ridge on distal humerus⦿ Insertion: Radial styloid process⦿ Action:
◼ Flexion of elbow especially if radius is partially pronated
◼ Initial stages of pronation and supination• Assists in pronation from a supinated
position• Assists in supination from a pronated
position
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⦿ Origin: ◼ Shorthead – coracoid process◼ Longhead – tubercle above glenoid
cavity⦿ Insertion: Radial Tuberosity⦿ Action :
◼ Flexion of elbow◼ Supinator of radius (inserts on posterior
aspect of radial tuberosity)• Uncrosses upper radius from pronated position
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⦿ Origin (3) : ◼ Longhead – Tubercle below glenoid
cavity◼ Lateral head – Humerus (back, upper,
lateral shaft)◼ Medial head – Humerus (back, lower
shaft)⦿ Insertion: Olecranon⦿ Action: Extension of elbow
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⦿ Origin: Lateral epicondyle⦿ Insertion: Lateral olecranon and
upper ulna⦿ Action: Assists triceps in extension
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⦿ Supination – Radius and Ulna parallel and palm faces anteriorly
⦿ Pronation – Radius crosses over Ulna and palm faces posteriorly
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⦿ Radial notch and head of radius⦿ Pivot joint⦿ Radius held in place by annular
ligament⦿ Allows pronation and supination
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⦿ Ulnar notch and ulnar head⦿ Pivot joint⦿ Radius anteriorly over head of ulna⦿ Separate synovial cavity from radiocarpal
joint cavity⦿ Articular disk connects styloid process of ulna
to ulnar notch◼ Holds radius and ulna together during movement
at the joint◼ Separates distal radioulnar joint from wrist joint
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⦿ Interosseous membrane – connects shafts of radius and ulna◼Holds Ulna and Radius together
during pronation and supination◼Acts as a site of muscle attachment
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⦿ Pronation:◼ Pronator teres◼ Pronator quadratus◼ Brachioradialis
⦿ Supination:◼ Biceps Brachii◼ Supinator◼ Brachioradialis
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⦿ Origin: Medial epicondyle of humerus and coronoid process of ulna
⦿ Insertion: Midlateral surface of radius⦿ Action:
◼ Pronation of arm◼ Assists in flexion of elbow
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⦿ Attachments: Anterior surface of distal ulna and radius
⦿ Action: Pulls radius across ulna in pronation
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⦿ Origin: ◼ Superficial layer – lateral epicondyle of humerus◼ Deep layer – Just below radial notch of ulna
⦿ Insertion: Radius between neck and insertion of pronator teres
⦿ Action: Supination of forearm
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Bones of the wrist and hand
Carpal bones (wrist)8 small bones2 Rows
Top 3 bones articulate with Radius and articular diskBottom 4 articulate with Metacarpals
Metacarpals5 - Thumb is Metacarpal I, Pinki is Metacarpal V
Phalanges14 - Each finger has 3 phalanges except the thumb which has 2
Metacarpals and PhalangesBase, Shaft and Head
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Wrist and Finger Joints
Radiocarpal joint - between top 3 carpal bones, radius and articular disk
Ellipsoid joint Flexion/ExtensionAdduction/Abduction
Midcarpal joint - between 2 rows of carpal bonesGliding joint
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Wrist and Finger Joints Continued
Carpometacarpal joints - between distal carpal bones and metacarpals
Thumb - Saddle jointFlexion/ExtensionAdduction/AbductionRotation
II-V - Saddle/GlidingFlexion/Extension and Gliding
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Wrist and Finger Joints Continued
Metacarpophalangeal joints - between metacarpals and phalanges
Hinge JointFlexion/ExtensionLimited Adduction/Abduction and rotation
Interphalangeal joints - between phalangesHinge Joint
Flexion/Extension
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Muscles of Wrist
Flexors:Common Flexor Origin - Medial Epicondyle of
Humerus
Flexor Carpi Radialis - Flexes and abducts the wrist
Palmaris Longus - Flexes the wristFlexor Carpi Ulnaris - Flexes and adducts the wrist
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Muscles of Wrist
Extensors:Common Extensor Origin - Lateral Epicondyle
of Humerus
Extensor Carpi Radialis Longus - Extends and abducts the wrist
Extensor Carpi Radialis Brevis - Extends and abducts the wrist
Extensor Carpi Ulnaris - Extends and adducts the wrist
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