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Forensic Osteology > Pelvic Girdle > Flashcards

Pelvic Girdle Flashcards

1
Q

what bones form the innominate bone?

A

ilium
ischium
pubis

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2
Q

what is the pelvic girdle made up of?

A

2 innominates (Os coxae) and the sacrum

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3
Q

what is the purpose of the pelvis?

A

is a link between the upper and lower body, major weight bearing structure

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4
Q

is the pelvis sexually dimorphic?

A

yes, most sexually dimorphic portion of the skeleton

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5
Q

what is the greater and lesser pelvis?

A

greater (false) pelvis sits above the inlet
lesser (true) pelvis sits below the inlet

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6
Q

what does the pelvis articulate with?

A

sacrum - auricular surface
femur - acetabulum
each other - pubic symphysis

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7
Q

what are the gluteal lines?

A

the lines on the ilium indicating where the gluteal muscles attach

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8
Q

where does the inguinal ligament attach to the ilium?

A

the anterior superior iliac spine to the pubis - pubic tubercle

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9
Q

where does satorius attach to the ilium?

A

the anterior superior iliac spine to the tibia - upper medial

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10
Q

what is the function of satorius?

A

flexion, lateral rotation and abduction of the thigh at the hip joint

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11
Q

where does tensor fasciae latae attach to the ilium?

A

the anterior superior iliac spine to the tibia - via iliotibial tract

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12
Q

what is the function of tensor fasciae latae?

A

flexion, abduction and rotation of the thigh

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13
Q

where does rectus femoris attach to the ilium?

A

the anterior inferior iliac spine to patella - anterior head

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14
Q

what is the function of rectus femoris?

A

extension of leg at knee joint and flexion of thigh at hip joint

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15
Q

where does the iliofemoral ligament attach to the ilium?

A

the anterior inferior iliac spine to femur - intertrochanteric line

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16
Q

what is the function of the iliofemoral ligament?

A

maintains pelvis position and keeps the femoral head in acetabulum

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17
Q

where does iliacus attach to the ilium?

A

the iliac fossa to femur - lesser trochanter

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18
Q

what if the function of iliacus?

A

flexes the thigh at hip joint

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19
Q

where does ligamentum teres attach to the ilium?

A

acetabulum, from femur - fovea capitis

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20
Q

what is the function of ligamentum teres?

A

prevent displacement of the femur

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21
Q

where does transverse acetabular ligament attach to the ilium?

A

at the edge of acetabulum, across acetabular notch

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22
Q

what is the function of transverse acetabular ligament?

A

prevent displacement of the femur

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23
Q

where does the inguinal ligament attach to the pubis?

A

pubic tubercle

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23
Q

what is the function of pectineus?

A

thigh flexion and adduction

23
Q

where does pectineus attach to the pubis?

A

the pectineal line of superior ramus of the pubis, to femur - lesser trochanter and linea aspers

23
Q

where does adductor magnus attach to the pubis?

A

inferior pubis ramus (also ischial tuberosity) to femur - linea aspera and adductor tubercle

24
Q

what is the function of adductor magnus?

A

thigh adduction, extension and rotation

25
Q

where does adductor longus attach to the pubis?

A

anterior pubis to femur - linea aspera

26
Q

what is the function of adductor longus?

A

thigh adduction, flexion and medial rotation

27
Q

where does biceps femoris attach to the ischium?

A

the ischial tuberosity (long head, short head from femur) to fibula (later head) and tibia (lateral condyle)

28
Q

what is the function of biceps femoris?

A

knee flexion and rotation, hip extension

29
Q

where does semitendinosus attach to the ischium?

A

ischial tuberosity to tibia - medial diaphysis

30
Q

what is the function of semitendinosus?

A

knee flexion and rotation, hip extension

31
Q

where does semimembranosus attach to the ischium?

A

ischial tuberosity to tibia - posterior medial condyle

32
Q

what is the function of semimembranosus?

A

knee flexion and rotation, hip extension

33
Q

what is accessory iliac and sacral facets?

A

articulations between ilium and sacrum other than at position of auricular surface
non-metric trait

34
Q

what is a pre-auricular sulcus?

A

groove just inferior to caudal limb of auricular surface
non-metric trait

35
Q

what is an acetabular crease?

A

groove penetrating the lunate surface from the superior margin of the acetabular notch near the trace of the triradiate suture
non-metric trait

36
Q

what is dorsal pitting?

A

eroded areas on the pubic body
non-metric trait

37
Q

what can cause an underdeveloped acetabulum?

A

linked with congenital hip dysplasia
non-metric trait

38
Q

what is the difference between the greater sciatic notch in males and females?

A

male - narrow and deep
female - shallow and wide

39
Q

what is the difference between the auricular surface between males and females?

A

male - depressed and wide
female - raised and narrow

40
Q

what is the difference between the preauricular sulcus in males and females?

A

male - not present or illusionary
female - often present or well developed

41
Q

what is the difference between the postauricular space between males and females?

A

male - narrow
female - wide

42
Q

what is the difference between the ilium shape of males and females?

A

male - high and vertical
female - laterally divergent

43
Q

what is the difference between the pubic symphysis in males and females?

A

male - higher
female - lower

44
Q

what is the difference between the subpubic angle in males and females?

A

male - narrow V-shaped, acute angle
female - wide U-shaped, obtuse angle

45
Q

what is the difference between the subpubic concavity in males and females?

A

male - slight to no concavity
female - concavity present

46
Q

what is the difference between the ventral arc in males and females?

A

male - absent
female - present as elevated ridge extending inferolaterally across ventral pubis

47
Q

what is the difference between the medial ischiopubic ramus in males and females?

A

males - broad, flat and blunt. slightly everted
females - ridged, sharp edged, everted

48
Q

what is the difference between the shape of the pubic bone in males and females?

A

male - narrow
female - broad and rectangular

49
Q

what is the difference between the dorsal pubic pitting in males and females?

A

male - absent
female - present

50
Q

what is the method used for sex estimation in the pelvis?

A

Phenice method

51
Q

what 3 features are looked at in the Phenice method?

A

in order of discriminatory power -
ventral arc
subpubic concavity
medial ischiopubic ramus

and requires the pubis to be intact

52
Q

what is the difference between the sacrum shape in males and females?

A

male - long and narrow
female - short and broad

53
Q

what is the difference between the number of segments of the sacrum in males and females?

A

male - 5+
female - 5

54
Q

what is the difference between the body/alae proportions in males and females?

A

male - body wider
female - thirds

55
Q

what does sexual dimorphic features occur in the pelvis?

A

after puberty

Forensic Osteology (9 decks)

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