Musculoskeletal Flashcards
What are the muscles of the upper arm?
Anterior compartment
- biceps brachii
- brachialis
- corachobrachialis
Posterior compartment
- triceps brachii
What is the innervation of the anterior compartment of the upper arm?
Musculocutaneous nerve
What is the arterial supply of the anterior compartment of the upper arm?
Brachial artery
What are the attachments of the biceps brachii?
Two heads;
- long head attaches to supraglenoid tubercle
- short head attaches to coracoid process
- tendon inserts into radial tuberosity
As tendon enters forearm gives off bicipital aponeurosis which forms roof of cubital fossa
What is the function of the biceps brachii?
Supination of forearm
Also flexion of elbow and shoulder joints
What is the innervation of the biceps brachii?
Musculocutaneous nerve
What nerve root does the biceps tendon reflex test?
C6
What are the attachments of the corachobrachialis?
Lies deep to biceps brachii
- coracoid process of scapula, passes through axilla, medial side of humeral shaft
What is the function of corachobrachialis?
Flexion of shoulder
What is the innervation of corachobrachialis?
Musculocutaneous nerve
What are the attachments of brachialis?
More distal than other anterior compartment muscles, deep to biceps brachii
Medial and lateral humeral shaft to ulnar tuberosity
What is the function of brachialis?
Flexion of elbow
What is the innervation of brachialis?
Musculocutaneous nerve
What are the attachments of triceps brachii?
Medial head is deep to and covered by the other two
Origination
- long head; infraglenoid tubercle
- lateral head; humerus superior to radial groove
- medial head; humerus inferior to radial groove
Insertion;
- converge onto one tendon and insert into olecranon of ulna
What is the function of triceps brachii?
Extension of elbow
What is the innervation of triceps brachii?
Radial nerve
What root does the triceps tendon reflex test?
C7
What connects the radius and ulna?
Interosseous membrane - fibrous joint
What are the flexors of the wrist?
Flexor carpi radialis
Palmaris longus
Flexor carpi ulnaris
What nerve supplies the anterior compartment of the forearm?
Musculocutaneous nerve
What are the muscles in the first layer in the anterior forearm?
Pronator teres
Flexor carpi radialis (FCR)
Palmaris longus
Flexor carpi ulnaris (FCU)
What muscles make up the second layer of the anterior forearm?
Flexor digitorum superficialis
What muscles make up the third layer of the anterior forearm?
Flexor digitorum profundus (FDP)
Flexor pollicis longus (FPL)
What muscles make up the distal third layer of the anterior forearm?
Pronator quadratus
What are the muscles in the posterior compartment of the forearm?
Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Anconeus
What are the attachments of the anconeus?
Origin; lateral epicondyle of humerus
Insertion; lateral surface of olecranon
What is the innervation of the anconeus muscle?
Radial nerve (C7-C8)
What is the blood supply of the anconeus muscle?
posterior interosseous recurrent artery
What are the actions of the anconeus?
Assist in forearm extension at elbow
Stabilisation of elbow
What are the muscles of the anterior compartment of the thigh?
Sartorius
Pectineus
Quadriceps femoris
- vastus lateralis
- vastus intermedius
- vastus medialis
- rectus femoris
What is the innervation of the muscles in the anterior compartment of the thigh?
Femoral nerve (L2-L4)
What are the muscles in the medial compartment of the thigh?
AKA the hip adductors
Gracilis Obturator externus Adductor brevis Adductor longus Adductor magnus
What is the innervation of the muscles in the medial compartment of the thigh?
Obturator nerve (L2-L4)
What are the muscles in the posterior compartment of the thigh?
AKA the hamstrings
Lateral to Medial
- biceps femoris
- semitendinosus
- semimembranosus
What is the innervation of the soleus?
Ventral rami of S1 and S2
What is the innervation of the gastrocnemius?
Ventral rami of S1 and S2
What is the innervation of the muscles in the posterior compartment of the thigh?
Sciatic nerve
*all by tibial part except lateral head of biceps femoris which is common fibular part
What is the innervation of the glutes?
Gluteus maximus; inferior gluteal nerve
Gluteus medius and minimis; superior gluteal nerve
What are the muscles of the anterior leg?
Tibialis anterior
extensor digitorum longus
extensor hallucis longus
fibularis tertius
What is the innervation of the anterior leg muscles?
Deep fibular nerve
What are the muscles of the posterior leg?
Superficial
- soleus
- gastrocnemius
- plantaris
Deep
- popliteus
- tibialis posterior
- flexor hallucis longus
- flexor digitorum longus
What is the innervation of the muscles in the posterior leg?
Tibial nerve
What are the ligaments of the hip joint?
Intracapsular
- ligamentum teres
Extracapsular
- pubofemoral
- ischiofemoral
- iliofemoral
Bones of the hip joint and articulating surfaces
Femur: Femoral head
Pelvis: Acetabulum
What movement(s) does the gracilis muscle facilitate?
Hip adduction
Aids knee flexion
What movement(s) does the obturator externus facilitate?
External rotation of femur when hip in neutral position
Hip adduction when hip flexed
What movement(s) does the adductor brevis facilitate?
Hip adduction
Also flexion and medial rotation of thigh
What movement(s) does the adductor magnus facilitate?
Hip adduction
What movement(s) does the adductor longus facilitate?
Hip adduction
What movement(s) does the pectineus facilitate?
Flexion of hip
Also aids in hip adduction and medial rotation of femur
What movement(s) does the sartorius facilitate?
A synergist muscle; all actions are weak
Hip: flexion, adduction and lateral rotation
Knee: flexion, medial rotation when knee flexed
What movement(s) does the quadriceps femoris facilitate?
Extensor of knee
Flexion of hip
What movement(s) does the biceps femoris facilitate?
Knee flexion
External and internal rotation
Hip extension
What movement(s) does the semitendinosus facilitate?
Knee flexion
Hip extension
What movement(s) does the semimembranosus facilitate?
Knee flexion
Hip extension
What movement(s) does the gluteus maximus facilitate?
Hip extension, external rotation, abduction (superior part) and adduction (inferior part)
What movement(s) does the tibialis anterior facilitate?
Foot dorsiflexion and inversion
What movement(s) does the extensor digitorum longus facilitate?
Extension of toes, dorsiflexion of foot
What movement(s) does the extensor hallucis longus facilitate?
Extends big toe and dorsiflexes foot
Also assists in foot eversion and inversion
What movement(s) does the fibularis tertius facilitate?
Weak dorsiflexion and eversion at ankle
What movement(s) does the gastrocnemius facilitate?
Plantar flexion ankle
Flexion of knee
What movement(s) does the soleus facilitate?
Plantar flexion ankle
What movement(s) does the plantaris facilitate?
Weak plantar flexion ankle and flexion knee
What movement(s) does the popliteus facilitate?
Helps leg unlock from straight position by flexing and internally rotating knee joint
What movement(s) does the tibialis posterior facilitate?
Inversion ankle
Assists in plantar flexion ankle
What movement(s) does the flexor hallucis longus facilitate?
Plantar flex and invert ankle joint
What movement(s) does the flexor digitorum longus facilitate?
Plantar flex and invert ankle joint
What dermatome supplies the thumb?
C6
What dermatome supplies the index and middle fingers?
C7
What dermatome supplies the ring and little fingers?
C8
What area does C5 supply?
Shoulder and anterior arm/forearm
What area does T1 supply?
Axilla and anterior arm/forearm
What are the groups of axillary lymph nodes?
- Anterior/pectoral group
- Posterior/subscapular group
- Apical group
- Central group
- Lateral group
The axillary lymph nodes drain all lymph from the arms
What makes up the acromioclavicular joint?
The acromion of the scapula and the clavicle (lateral part)
What is the conoid tubercle?
Attachment point for the conoid tubercle on the clavicle, which binds the clavicle to the coracoid process of the scapula
What are the features of the scapula?
Acromion Coracoid process Glenoid cavity Spine of scapula Supraspinous and infraspinous fossa Subscapular fossa Medial and lateral border Inferior and superior angle Supra and infra-glenoid tubercles
What type of joint is the acromioclavicular joint?
Synovial plane
What type of joint is the sternoclavicular joint?
Synovial plane
What muscles are involved in elevation of scapula?
Levator scapulae
Upper fibres of trapezius
Rhomboid major and minor
What muscles are involved in depression of scapula?
Pectoralis major and minor
Lower fibres of trapezius
Latissimus dorsi
Serratus anterior
What muscles are involved in protraction of the scapula?
Serratus anterior (main function) Pectoralis major and minor
What muscles are involved in retraction of the scapula?
Trapezius (middle fibres)
Rhomboids
What muscles are involved in upward/lateral rotation of the scapula?
Trapezius (upper fibres)
Serratus anterior
What muscles are involved in downward/medial rotation of the scapula?
Levator scapulae
Rhomboids
Pectoralis minor
What is the glenoid labrum?
Rim of cartilage surrounding the glenoid cavity (socket) of the shoulder joint
What is the function of the glenoid labrum?
deepens glenoid cavity, increases surface of shoulder joint
What are the ligaments of the shoulder joint?
Acromioclavicular Coracoacromial Coracoclavicular Coracohumeral Glenohumeral ligaments (strengthen anterior joint capsule)
What does the coracohumeral do?
Strengthens the superior aspect of the joint capsule