MSK-anatomy-HARC Flashcards
which cranial nerve supplies the muscles of facial expression?
-cranial nerve VII—>the facial nerve
what are the muscles of facial expression responsible for?
- moving the skin to provide facial expression
- act as sphincters around the eyes and mouth
what are the muscles of mastication responsible for?
moving the mandible at the Temporomandibular joint
which cranial nerve supplies the muscles of mastication?
cranial nerve V – the trigeminal nerve
where are the muscles of mastication derived from?
pharyngeal arch I
what are the different branches of the trigeminal nerve and what types of nerves are they?
- Ophthalmic (V1)- sensory
- Maxillary (V2)- sensory
- Mandibular (V3)- sensory & motor to muscles of mastication
name the branches of the facial nerve?
Temporal Zygomatic Buccal Marginal mandibular Cervical
how many cervical vertebrae are there?
7
how many cervical spinal nerves are there?
8
how many thoracic vertebrae and spinal nerves are there?
12
how many lumbar vertebrae and spinal nerves are there?
5
how many sacral vertebrae and spinal nerves are there?
5
how many coccygeal vertebrae are there?
3/4
how many coccygeal spinal nerves?
1
what forms the coccyx?
3/4 coccygeal vertebrae are fused
what are the roles of intervertebral discs?
- act as shock absorbers by keeping vertebrae separated when there is impact
- provide flexibility to spine-facilitating flexion and extension
what is the the annulus fibrosis made up of?
- made of fibrocartilage
- tough and collagenous
what is the role of the annulus fibrosis?
prevents over-rotation of the vertebrae
what is the nucleus pulposus made up of?
jelly-like- mainly composed of water & loose network of collagen
what is the role of the nucleus pulposus?
allows discs to withstand forces of compression and torsion
which cervical vertebrae is atlas?
C1
what is different about atlas compared with other cervical vertebrae?
C1 is only cervical vertebra that has no spinous process
which cervical vertebrae is axis?
C2
does C2 have a spinous process?
yes-bifid spinous process
what is the joint between skull base and C1 called?
Atlanto-occipital joint
which movements occur at the Atlanto-occipital joint?
Flexion & extension occurs at this joint between the skull & C1 (e.g. when you nod & say yes)
what is the joint between c1 and c2 called?
Atlanto-axial joint
what does the articulation between c1 and c2 allow?
allows you to shake your head left & right (eg. when you shake your head & say no)
how is c1 arranged above c2?
C1 slotted over C2 (anterior arch of C1 slots over the dens process of C2)
what is the role of the ligamentum nuchae?
limits hyperflexion of neck, keeps your head from dropping
what is the role of suprapinous ligament?
strong, fibrous cord that helps maintain upright position of head and (limit hyperflexion of the whole vertebral column)
what is the role of the interspinous ligament?
limit flexion by restricting separation of spinous process
what is the role of the ligamentum flavum?
maintains upright posture, helps preserve normal curvature and straightens column after flexion (elasticity can reduce with old age)
what is the role of anterior longitudinal ligament?
limits extension
what is the role of posterior longitudinal ligament?
limits flexion
the temporalis muscle is innervated by which muscle? a-Facial nerve b-Ophthalmic nerve c-Mandibular nerve d-Maxillary nerve e-Superficial temporal nerve
c-mandibular nerve
which of these structures does not pass through the jugular foramen? a-CN IX b-Internal jugular vein c-CN XII d-CN X e-CN XI
c-CN XII
which bone of the forearm does the capitulum articulate with?
articulates with radius (round head)
which bone of the forearm does the trochlea articulate with?
articulates with ulna
what are the 4 rotator cuff muscles?
SITS
- supraspinatus
- infraspinatus
- teres minor
- subscapularis
what is the role of supraspinatus?
initiation of abduction
what is the role of the infraspinatus?
lateral rotation of humerus
what is the role of the teres minor?
lateral rotation of humerus
what is the role of the subscapularis?
medial rotation of humerus
where is the innervation of the upper limb derived from?
derived from brachial plexus
what is the order of the brachial plexus?
roots—>trunks—->divisions—->cords—–>terminal nerves
what are the different roots of the brachial plexus?
c5 c6 c7 c8 t1
what are the different terminal nerves of the brachial plexus?
- musculocutaneous
- median
- radial
- ulnar
where are the cords of the brachial plexus arranged?
around 2nd part of axillary artery
what is the median nerve formed by?
lateral and medial cords
what is the musculocutaneous nerve formed by?
lateral cord
what is the radial nerve formed by?
posterior cord
what is the ulnar cord formed by?
medial cord
which roots form musculocutaneous nerve?
c5/6/7
only nerve with no t1
which roots form median nerve?
c6/ c7/ c8/ t1
which roots form radial nerve?
c5/ c6/ c7/ c8/ t1
which roots form ulnar nerve?
c7/ c8/ t1
what are the muscles in the anterior compartment of the upper arm?
BBC
- biceps brachii
- brachialis
- coracobrachialis
which nerve innervates the anterior compartment of the upper arm?
musculocutaneous nerve
what is the role of the biceps brachii?
flexor & supinator of the forearm + weak flexor of humerus
what is the role of the brachialis?
flexor of forearm
what is the role of the coracobrachialis?
flexor and adductor of humerus
which muscles make up the posterior compartment of the upper arm?
medial, lateral & long heads of triceps brachii
which nerve innervates the posterior compartment of the forearm?
radial nerve
what is the role of triceps brachii?
extension of forearm
what are the 3 ligaments of the elbow joint?
- radial collateral ligament
- annular ligament
- ulna collateral ligament
what are the primary muscles of supination?
- Biceps brachii
- Supinator (posterior- deep layer)
what are the primary muscles of pronation?
- Pronator quadratus (anterior- deep layer)
- Pronator teres (anterior- superficial layer)
are muscles in the anterior compartment of forearm extensors or flexors?
flexors