Mm. cingulorum membri THORACICI et PELVINI Flashcards
MUSCLES OF THORACIC GIRDLE
SUPERFICIAL:
- M.Trapezius
- M. Sternocleidomastoideus
- M.Omotransversarius
- M.Latissimus Dorsi
- M. Pectoralis superficialis
DEEP:
- M. Pectoralis Profundus
- M.Rhomboideus
- M. Serratus Ventralis
MUSCLES of PELVIC GIRDLE
Muscles + Intersp.
From Medial --> Lateral Min --> Ilio --> Quadra 1. M.Psoas Minor (white) 2. M. Iliopsoas - M.Psoas Major - M. Iliacus 3. M. Quadratus Lumborum
M.Psoas Minor INSERTS on ? in:
EQ: Tuberculum m. psoas minoris
CA: Eminentia Iliopubica
MUSCLES OF THORACIC GIRDLE
1. M. Trapezius
o O: between C3-Th9 region.
- pars cervicalis: RAPHE CERVICIS
- pars thoracica: from SUPRASPINOUS LIG.
o I:
- cervical part inserts on PROX ¾ of SPINA SCAPULAE
(distally there is the omotransversarius muscle);
- thoracic part inserts on PROX third of SPINA SCAPULAE
o A:
supports trunk,
elevates (lifts) forelimb,
draws it cranially
MUSCLES OF THORACIC GIRDLE
2. M. Sternocleidomastoideus
It has two main parts:
- M. sternocephalicus and
- M. brachiocephalicus
o 1. M. STERNOCEPHALLICUS –> From sternum to head
O: MANUBRIUM sterni
I:
- M. sternomastoideus: MASTOID part of temporal bone
- M. sternooccipitalis: CRISTA NUCHEA of occipital bone
A:
UNILAT contraction draws HEAD and NECK to one side (latero-ventral flexion),
BILAT contraction draws HEAD down
o 2. M. BRACHIOCEPHALLICUS
->From humerus to Head+NECK
- M. Cleidobrachialis:
O: On distal CRANIAL surface of HUMERUS and CRISTA HUMERII,
I: on CLAVICULAR INTERSECTION
- M. CleidoCEPHALLICUS
O: on CLAVICULAR INTERSECTION
I: - M. cleidomastoideus: MASTOID part of temporal bone
- M. cleidocervicalis: RAPHE CERVICIS, over cranial half of neck
A:
- If forelimb is fixed =
UNILAT contraction of the muscle moves HEAD into the LATERAL direction,
BILAT contraction fixes HEAD and NECK (or bends downward).
- If limb is free (it’s in an elevated position), it will move FL –> CRANIALLY.
MUSCLES OF THORACIC GIRDLE
3. M.Omotransversarius
o O: distal part of SPINA SCAPULAE,
then runs UNDER M. STERNOCLEIDO MASTOIDEUS
o I: caudal border of ALA ATLANTIS
o A:
- if limb is FREE: draws SHOULDER cranially;
- if limb is FIXED: flexes NECK laterally
MUSCLES OF THORACIC GIRDLE
Which muscle runs over the M. Omotransversarius?
M. STERNOCLEIDO MASTOIDEUS
MUSCLES OF THORACIC GIRDLE
4. M.Latissimus Dorsi
o O: SUPERF. layer of THORACOLUMBAR FASCIA
(from spinous processes of the last 7-8 thoracic
and lumbar vertebrae); also muscular attachment
proximally to the last few ribs
o I: TUBEROSITAS TERES MAJOR
(together with m. teres major)
o A: draws FREE limb CAUDALLY;
together with m. teres major FLEXES SHOULDER
MUSCLES OF THORACIC GIRDLE
5. M. Pectoralis superficialis
It has two parts:
- M. Pectoralis descendens and
- M. Pectoralis Transversus
o O:
- M. pectoralis descendens: from MANUBRIUM sterni,
- M. pectoralis transversus from 1-3rd STERNEBRAES
o I: CRISTA TUBERCULI MAJOR of humerus, upper part of crista humeri
o A:
- ventral connection to forelimb,
- adduction,
- draws limb cranially or caudally depending its position
MUSCLES OF THORACIC GIRDLE
1. M. Pectoralis Profundus
Also called: m. pectoralis ascendens
o O: ALL sternebrae of STERNUM and COSTAL CARTILLAGES of TRUE ribs
o I: main part inserts on MINOR TUBERCLE of humerus
(A small APONEUROSIS joins to MAJOR TUBERCLE)
o A: - supports trunk, - behaving as a strong RETRACTOR (draws limb caudally) and - ADDUCTOR of FL
MUSCLES OF THORACIC GIRDLE
2. M. Rhomboideus
O:
CRISTA NUCHEA of occipital bone (PARS CAPITIS);
From RAPHE CERVIVIS –> spinous processes of Th1-3 vertebrae (PARS CERVICIS);
and from processus spinosus of
Th4-7 vertebrae (pars thoracis)
o I: dorsomedial border of SCAPULAE
o A:
- Elevates limb and
- Pulls base of scapula against trunk forwards or backwards (depending on which part will contract more)
MUSCLES OF THORACIC GIRDLE
3. M.Serratus Ventralis
O:
- CERVICAL part: from PROC. TRANSVERSUS of C2-7,
- THORACIC part from middle of ribs 1-8.
I: FACIES SERRATA on scapula (medially)
A: - supports trunk, - helps at inspiration, - carries shoulder cranial or caudal with respect to position of forelimb
MUSCLES of PELVIC GIRDLE
1. PSOAS MINOR
O: bodies of last few THORACIC and 1-5th LUMBAR vertebrae; mainly TENDINOUS
I: LINEA ARCUATA of iliac bone,
near to iliopubic eminence
A:
If VERTEBRAL COLLUMN is fixed:
- draws pelvis into a deeper position.
When PELVIS is fixed:
arches LUMBAR region and flexes VERT.COLLUMN
MUSCLES of PELVIC GIRDLE
2. M. Iliopsoas
It has two parts:
- M. psoas major and
- M. iliacus medialis et lateralis
O:
1. M. psoas major:
- Starts VENTRALLY from BODIES and
TRANSVERSE PROCESS of lumbar vertebrae,
- the two M.Iliacus medialis et lateralis:
- Arising between LINEA ARCUATA and LAT.BORDER of iliac bone
I: TOGETHER on TROCHANTER MINOR of femur (medially)
A:
Draws pelvic limb forward by FLEXING the HIP;
- When femur is fixed:
Flexion and Fixation of vertebral column
MUSCLES of PELVIC GIRDLE
3. M. Quadratus Lumborum
O:
- 11-13th thoracic vertebra ventrally,
- last two ribs,
- lumbar vertebra’s transverse processes
I: medial surface of iliac wing
(between articular surface and cranial ventral iliac spine of tuber coxae)
Action:
Fixation and DORSAL Flexion of vertebral column
CANALIS FEMORALIS
= Channel, where femoral vessels and nerves go towards hindlimb.
Its opening from abdominal cavity, underneath inguinal ligament is the femoral ring (ANULUS FEMORALIS ).
Femoral triangle forms its borders:
- M. sartorius pars caudalis (rostral),
- M. Pectineus (caudal),
- Lig. inguinale (proximal),
- M. iliopsoas (medial),
- Femoral fascia (lateral)
Space under inguinal ligament - before canalis femoralis starts - can be divided into:
- Lacuna vasorum (for femoral vessels) and
- Lacuna musculorum (for m. iliopsoas).
