Anatomy Flashcards
Gluteal muscles
Gluteus maximus
Gluteus medius
Gluteus minimus
Gluteus maximus
Origin: Ilium
Insertion: Gluteal tuberosity of the femur
Innervation: Inferior gluteal nerve
Function: Extension and lateral rotation of the hip joint, supports the knee by contributing to the iliotibial tract
Gluteus medius and minimus
Origin: Ilium
Insertion: Greater trochanter of the femur
Innervation: Superior gluteal nerve
Function: Abduction and medial rotation of the hip joint
Muscles of the anterior compartment of the thigh (extensors)
Rectus femoris
Vastus medialis
Vastus lateralis
Vastus intermedialis
Muscles of the posterior compartment of the thigh (flexors)
Biceps femoris
Semitendinous
Semimembranosus
Also involved in medial and lateral rotation during flexion
Muscles of the medial compartment of the thigh (adductors)
Gracilis Pectineus Adductor longus Adductor brevis Adductor magnus Obturator externus
Small gluteal muscles
Piriformis Gemellus superior Gemellus inferior Obturator internus Quadratus femoris
Function: stabilises the hip, lateral rotation of extended thigh
Rectus femoris
Origin: ASIS and ilium above acetabulum
Insertion: Quadriceps tendon
Innervation: Femoral nerve
Function: Flexes thigh at hip and extends leg at knee
Vastus medialis
Origin: Medial side of femur
Insertion: Quadriceps tendon and medial border of patella
Innervation: Femoral nerve
Function: extends the leg at knee joint
Vastus intermedius
Origin: Anteriolateral femur
Insertion: Quadriceps tendon
Innervation: Femoral nerve
Function: Extension of the knee
Vastus lateralis
Origin: Greater trochanter of femur
Insertion: Quadriceps tendon
Innervation: Femoral nerve
Function: Extension of the knee
Femoral nerve
L2-4
Motor branch supplies the anterior muscle compartment
Sensory branch supplies the anterior thigh, knee and medial side of leg and foot via the saphenous nerve
Obturator nerve
L2-4
Motor: Supplies the medial compartment of the thigh
Sensory: skin over medial thigh
Sciatic nerve L4-S3
Motor: Posterior compartment of the thigh
Sensory branch: skin over leg and foot
Divides into the tibial and common fibular nerve within the popliteal fossa
Common fibular nerve
Divides into the superficial and deep fibular nerve
Biceps brachii
Long head origin: supraglenoid tubercle
Short head origin: Coracoid process (conjoint tendon)
Insertion: Radial tuberosity
Innervation: musculocutaneous nerve
BS: brachial artery
Function: Flexion of shoulder and elbow joint
Coracobrachialis
Origin: Coracoid process (conjoint tendon)
Insertion: Medial aspect of humeral shaft
Innervation: musculocutaneous nerve
BS: brachial artery
Function: Flexion of shoulder
Brachialis
Origin: Distal part of the anterior humerus Insertion: Ulnar tuberosity Innervation: musculocutaneous nerve BS: brachial artery Function: Flexion of elbow joint
Brachioradialis
Origin: Lateral supracondylar ridge Insertion: Radial styloid process Innervation: radial nerve BS: radial artery Function: Flexion of elbow when partially pronated, supination and pronation of radioulnar joint by 90 degrees
Triceps brachii
Origin:
Long head = infraglenoid tubercle
Lateral head = posterior aspect of humerus above radial groove
Medial head = posterior aspect of humerus below radial groove
Insertion: Olecranon process of ulna
Innervation: radial nerve
Function: Extension of shoulder and elbow joint, adduction of arm
Lateral cord
Gives rise to lateral pectoral nerve that innervate the pectoral muscles (major and minor)
Forms lateral part of median nerve, and musculocutaneous nerve
Terminates as the lateral cutaneous nerve of the forearm supplying the ventral and dorsal aspect of the lateral forearm skin (sensory function)
Medial cord
Forms medial pectoral nerve which innervates the pectoral muscles
Forms medial part of median nerve, and ulnar nerve
Ulnar nerve supplies muscles of hand
Median nerve supplies muscles of anterior compartment of forearm
Forms cutaneous nerves of arm and forearm
Posterior cord
Forms the radial and axillary nerves
Radial nerve: Supplies posterior aspect of arm and forearm
The axillary nerve supplies teres minor and the deltoid muscles, as well as a small area of skin over the insertion of the deltoid (badge area)
Muscles of anterior compartment of arm
Biceps brachii
Coracobrachialis
Brachialis
Responsible for flexion of the arm with the anterior fibres of the deltoid
Muscles of posterior compartment of arm
Triceps brachii
Responsible for extension of the arm with the posterior fibres of the deltoid and the latissimus dorsi
Superficial muscles of anterior compartment of forearm
Flexor carpi radialis
Flexor carpi ulnaris
Pronator teres
Palmaris longus
Intermediate muscles of anterior compartment of forearm
Flexor digitorum superficialis
Deep muscles of anterior compartment of forearm
Flexor digitorum profundus
Flexor pollicis longus
Pronator quadratus
Common origin of the flexors of the forearm
Medial epicondyle
Clinical significance of medial epicondyle
Epicondylitis results in tendon inflammation due to overuse or excessive gripping
Golfer’s elbow
Flexor carpi ulnaris
Origin: medial epicondyle
Insertion: Pisiform, hamate and 5th metacarpal
Function: flexion of the wrist and adduction of hand
Flexor carpi radialis
Origin: Medial epicondyle
Insertion: 2nd and 3rd metacarpal
Function: Flexion and abduction at the wrist
Palmaris longus
Origin: Medial epicondyle
Insertion: Palmar aponeurosis and flexor retinaculum
Innervation = median ner
Function: flexion of wrist
Pronator teres
Origin: Medial epicondyle
Insertion: Midshaft of radius
Innervation: median nerve
Function: pronation of forearm
Flexor digitorum superficialis
Origin: Medial epicondyle and radius
Insertion: 2nd-5th middle phalanges
Innervation: Median nerve
Function: Flexion of MCP, PIP and wrist joints
Muscles innervated by the median nerve
Flexor digitorum superficialis
Flexor carpi radialis
Palmaris longus
Pronator teres
Flexor pollicis longus
Origin: Radius and interosseous membrane
Insertion: Base of thumb phalanx
Function: Flexion of thumb at interphalangeal joint and metacarpophalangeal joint, flexion of wrist
Pronator quadratus
Origin: Medial aspect of ulna
Insertion: Medial aspect of radius
Innervation: Median nerve
Function: pronation of wrist
Muscles innervated by the ulnar nerve
flexor carpi ulnaris muscle, medial one-half of the flexor digitorum profundus muscle, lateral two lumbrical muscles, flexor pollicis brevis muscle
Muscles innervated by the radial nerve
Triceps brachii muscle, Brachioradialis muscle, Extensor carpi radialis longus muscle
Superficial/sensory branch of radial nerve
The skin of the posterior surface of the arm
The distal skin of the lateral surface of the forearm
The skin of the lateral surface of the dorsum of the hand
The dorsal skin of the lateral two and the half of the fingers
Gait cycle phases
Stance phase (60%):
- Initial contact
- Loading response
- Midstance
- Terminal stance
- Pre-swing
Swing phase (40%):
- Initial swing
- Mid-swing
- Terminal swing
Initial contact
Hip flexion
Knee neutral/extended
Ankle dorsiflexion
1st MTPJ dorsiflexion
Loading response
Hip flexion
Knee flexion
Ankle plantarflexion
1st MTPJ neutral
Midstance
Hip neutral
Knee extension
Ankle neutral
1st MTPJ neutral
Terminal stance
Hip extension
Knee full extension
Ankle dorsiflexion
1st MTPJ dorsiflexion/neutral
Pre-swing
Hip neutral
Hip flexion
Ankle plantarflexion
1st MTPJ dorsiflexion
Initial-swing
Hip neutral/flexion
Knee flexion
Ankle dorsiflexion/neutral
1st MTPJ dorsiflexion/neutral
Mid-swing
Hip flexion
Knee flexion
Ankle dorsiflexion
1st MTPJ dorsiflexion
Terminal
Hip flexion
Knee neutral/flexion
Ankle dorsiflexion
1st MTPJ dorsiflexion
Which ligaments stabilise the shoulder?
Coracoacromial ligament
Acromioclavicular ligament
Coracoclavicular ligament (formed of 2 parts to act as a major stabiliser)
Glenohumeral ligament (superior, middle, and inferior)
Coracoacromial ligament
Prevents superior dislocation by supporting the head of the humerus
Movements of the glenohumeral joint
Flexion Extension Adduction Abduction Medial rotation Lateral rotation Circumduction
Deltoid
Origin: Spine of scapula, acromion, clavicle
Insertion: Deltoid tuberosity of the humerus
Innervation: axillary nerve
Function:
Lateral fibres = abduction of the shoulder 15-90 degrees
Anterior fibres = flexion and medial rotation of shoulder
Posterior fibres = extension and lateral rotation of shoulder
Adductors of the shoulder/arm
Latissimus dorsi
Pectoralis major
Rhomboid major and minor
Levator scapulae
Latissimus dorsi
Origin: Spinous processes of T7-12 and thoracolumbar fascia
Insertion: Floor of intertubercular groove of humerus
Innervation: thoracodorsal nerve from posterior cord
Function: adduction of the shoulder, extension of the shoulder/arm
Pectoralis major
Origin: Clavicle, sternum, costal cartilage
Insertion: Lateral lip of the intertubercular sulcus of the humerus
Innervation: medial and lateral pectoral nerves
Function: adduction and medial rotation of the shoulder
Pectoralis minor
Origin: Ribs 3-5
Insertion: Coracoid process of scapula
Innervation: Medial pectoral nerve
Function: protraction of the scapula (Shoulder moves down and scapula moves outwards)