Limbs 1 Flashcards
How are the upper limbs connected to the trunk (joints)
- Sternoclavicular joints
- Scapulo-thoracic joints
Which joints connecting UL to trunk are TRUE?
Sternoclavicular
Which joints connecting UL to trunk are virtual/physiological?
Scapulothoracic
What movements do the scapulothoracic joints allow?
Movements of the scapula against the posterior and lateral thoracic wall
How are the lower limbs connected to the trunk? (joints)
Sacroiliac joints
Where are the sacroiliac joints?
Between pelvis and sacrum
What are the 4 regions of the upper limnb?
- The pectoral girdle
- The arm
- The forearm
- The hand
Label bones 1-8
1) Clavicle
2) Scapula
3) Humerus
4) Radius
5) Ulna
6) Carpal bones
7) Metacarpals
8) Phalanges
Describe the attachments of the clavicle?
- Medial end articulates with thoracic wall of the trunk at the manubrium
- Lateral end articulates with scapular acromion
What structures does the clavicle support?
Scapiula and rest of upper limb which are suspended from it
Label this diagram of the posterior humerus
- Humerus shaft
- Medial Epicondyle
- Deltoid Tuberosity
- Radial Groove
- Lateral epicondyle
Label this diagram and name the bone.
Scapula
A - Acromion
C - Coracoid process
G - Glenoid fossa
Sub - Subscapular fossa
S - Supraspinous fossa
I - Infraspinous
Sp - Scapular spine
Which bone articulates with the glenoid fossa of the scapula?
The humoral head (proximal end of humerus)
Describe the articulation of the humerus?
Superiorly - Glenoid fossa - Shoulder joint
Inferiorly - Radius and Ulna - Elbow joint
Label this diagram of the anterior humerus
- Greater tubercle
- Intertubercular Sulcus (Bicipital groove)
- Lateral Epicondyle
- Lesser tubercle
Describe articulation of the radius and ulna?
At proximal end - Articulates with condyles of the humerus
At distal end - Articulates with the proximal carpal bones of the wrist
Describe the articulation of the hands and wrists
- The distal ends of the radius and ulna articulate with the proximal row of carpal bones, with the exception of pisiform (a sesamoid bone).
- The proximal row of the carpals articulate with the metacarpals of the hand, which in turn articulate with the phalanges of the digits
Label this diagram of the radius and ulna?
- Radius
- Radial tuberosity
- Ulna
What connects the radius and ulna together?
The interossus membrane
(fibrous joint)
Some Lovers Try Positions They Can’t Handle
Label this diagram of the hand (1-8)
- Capitate
- Trapezoid
- Tubercle of the trapezoid
- Tubercle of the scaphoid
- Lunate
- Triquetrum
- Pisiform
- Hook of hamate
Label this diagram of the hand (9-12)
- Base
10.Shaft - Tubercle
- Head
What are the 3 sections of the phalanges
Distal
Middle
Proximal
How many phalanges does each finger have
Every finger has 3 except the thumb which has 2
What kind of joints join the phalanges?
Synovial
What are the three types of synovial joints?
- Uniaxial - mvmt in 1 direction
- Biaxial - mvmt in 2 different planes
- Multiaxial - mvmt on several axes
What are the 3 factors of joint mobility classification?
- Synarthosis - little/no mobility
- Amphiarthosis - Limited mobility
- Diarthosis - Freely mobile
The more mobile a joint…
the less stable it is
What is a retinaculum
A retinaculum is thickened band of deep fascia found close to a joint. This band holds tendons down during muscle contraction to prevent bow-stringing, which might compromise function.
What is a bursa and where are they found (give example)?
- A bursa is a closed sac of a serous memebrane which secrete lubricating fluid to their interior
- Found at body sites subject to friction.(eg. elbow)
What type of joint is the sternoclavicular joint?
Synovial saddle joint
How is the sternoclavicular joint divided and stabilised
- Joint cavity divided by fibrous articular disc
- Stabilised with a number of ligaments
Describe the mobility of the sternoclavicular joint?
Significant mobility during clavicle elevation and protraction/retraction of the scapula
What type of joint is the Acromioclavicular joint (ACJ)and where is it located?
Type- Plane synovial joint
Location - Between the lateral end of clavicle and the acromion process of the scapula
What lies in the joint cavity of an acromioclavicular joint?
Incomplete wedge of fibrocartilage
Describe the mobility of the acromioclavicular joint?
- Rotation and some vertical and anterior/posterior movements
- Ligaments and muscles limit movements and stabilise the joint
Describe the movements that the scapulothoracic joint allows?
Movements of the scapula against the posterior and lateral thoracic wall.
What type of joint is the glenohumeral joint and where is it located?
Type - Ball and socket synovial joint
Location- Shoulder joint
Describe the mobility of the glenohumeral joint
Abduction, adduction, medial and lateral rotation, flexion, extension and circumduction.
Describe the mobility of the elbow joint
Configured so that flexion and extension occur at any degree of pronation/supination
Label this diagram of the elbow joint and describe the position and view it is in?
Position - Full flexion and anterior view
1) Radial fossa
2) Capitulum
3) Trochlea
4) Coronoid fossa
5) Coronoid process of ulna
Which structure lies in the olecranon fossa of the humerus in the posterior part of the elbow joint?
What type of joint is the wrist joint?
synovial joint between proximal carpal bone
there’s 2 names
What are the joints of the carpals called?
Label this diagram of the joints and ligaments of the hand
1.Palmar ligament (same as 8)
2.Distal interphalangeal joint
3.Proximal interphalangeal joint
4.Metacarpophalangeal joint
5.Collateral ligament
6. ‘Cord like part of collateral ligament
7. Fan like part of collateral ligament’
What are compartments (in limb anatomy)?
- Groups of limb muscle with distinct function, same nerve supply, same blood supply.
- Compartments are separated by connective tissue walls
Which 2 muscle groups serve the shoulder region?
- Pectoral girdle muscles (anterior and posterior axio-appendicular muscles)
- Intrinsic shoulder muscles (scapulohumeral muscles)
What are the pectoral girdle muscles?
What are the intrinsic shoulder muscles
What are the names of the rotator cuff muscles? (4)
- supraspinatus
- infraspinatus
- teres minor
- subscapularis (on the deep surface of the scapula so not visible)
What is the action of the intrinsic shoulder muscles?
Act to move humerus at shoulder joint
- Also stabilise the shoulder joint by holding HH in glenoid fossa
What are the muscles of the anterior flexor compartment of the arm
- Biceps brachii
- Coracobrachialis
- Brachialis
What are the attachements of the biceps brachii?
LONG HEAD ORIGIN: the supraglenoid tubercle of the scapula
SHORT HEAD ORIGIN: originates from the coracoid process of the scapula.
INSERTION: distally into the radial tuberosity and the fascia at cubital fossa via the bicipital aponeurosis.
What are the attachments of the brachialis?
ORIGIN: the humeral shaft
INSERTION: coronoid process of ulna
What are the attachments of the coracobrachialis
ORIGIN: the coracoid process of the scapula.
INSERTION: humeral shaft
What is the action of the brachialis?
Flexion at elbow
What is the action of the biceps brachii?
Supination of the forearm. It also flexes the arm at the elbow and at the shoulder.
What is the action of the coracobrachialis?
Flexion of the arm at the shoulder, and weak adduction.
What are the muscles of the posterior extensor compartment of the arm
and what nerve supplies them?
Muscle
* Triceps
* Anconeus
Nerve: Radial nerve
What are the three compartments of the forearm muscles?
- Superficial flexor compartment
- Deep flexor compartment
- Extensor compartmetn
Guide to forearm muscle terminology:
Name the muscles in the superficial flexor compartment of the forearm
- Pronator teres (PT)
- Flexor carpi radialis (FCR)
- Palmaris longus (PL)
- Flexor digitorum superficialis (FDS)
- Flexor carpi ulnaris (FCU)
What is the common flexor origin of the superficial flexor compartment of the forearm?
Medial epicondyle of the humerus
What is the action of the flexor carpi ulnaris?
Flexion and ADduction of the wrist
What is the action of the palmaris longus?
Flexion at the wrist
What is the distal attachment of the palmaris longus and how does it get there?
- Palmar aponeurosis
- Passes over the flexor retinaculum in the carpal tunnel
What is the action of the flexor carpi radialis?
Flexion and ABduction of the wrist
What is the action of the pronator teres?
Pronation of the forearm
Name the muscle in the intermediate flexor compartment of the forearm?
Flexor digitorum superficialis