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DAN NUSSEY > LOCOMOTION > Flashcards

LOCOMOTION Flashcards

1
Q

Proximal limb bones are called what?

A

Humerus

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2
Q

Distal limb bones are the what in:

a) forelimbs?
b) hind limbs?

A

a) radius

b) tibia

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3
Q

The ulna is found in (a) limbs and the fibula is found in (b) limbs.

A

a) fore

b) hind

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4
Q

What are the metacarpels and metatarsels?

A

bones prior to the phalanges, carpels are in forelimbs and tarsels in hind

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5
Q

a) Digits contain what bones?.

b) 4 have how many and 1 has?

A

a) phalanges

b) 4 have 3 and 1 has 2

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6
Q

a) What did the basic amniote pectoral girdle look like?
b) Contrast this to the ancestral pectoral girdle in mammals?
c) What did this allow?
d) Is the pectoral girdle fused to spine? What does this allow?

A

a) very basic
b) shows reduction in ventral portion, leaving clavicle and dorsal portion extended to form scapula
c) greater musculature

d) NO, allows greater mobility and shock absorption
- allows for a muscular sling

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7
Q

How did the pelvic girdle change?

What did this mean?

A 
the illium (upper portion) rotated and extended whereas the lower portions (ischium and pubis) were rotated backwards
-extends forward of joint and allows greater musculature
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8
Q

Name the 3 processes?

A
  • elbow (olecranon)
  • hip (throchanter)
  • ankle or heel (calcaneus)
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9
Q

Bones are the (a) and (b) are the fulcrums.

A
  • levers

- joints

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10
Q

What provides in forces?
What provides out forces?
Distance to in lever from fulcrum to in force?
Distance to out lever from fulcrum to out force?

A
  • pulling of tendons
  • teeth, claws, feet etc.
  • In-lever arm
  • Out- lever arm
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11
Q

a) A low in lever but high out lever ratio means what?

b) A high in lever but low out lever ratio means what?

A

a) lots of power, but little speed

b) little power, but lots of speed

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12
Q

Specialisation for cursorial locomotion

A
  • distal segments greater than proximal
  • clavicle reduction or loss to aid free scapula movement
  • shift from plantigrade to digitigrade to unduligrade stance
  • flexion and extension of spine
  • incorporating suspension
  • moving muscle attachment to have greater limb control, closer to pivot joint
  • reposition scapula as a shoulder girdle so that limbs are underneath
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13
Q

How are stride rates increased?

A
  • reduced muscle mass in limbs, use long distal tendons
  • lose muscles required for side to side movement
  • lose bone mass, fibula is greatly reduced
  • fusion of metacarpels
  • joints act as hinges to avoid dislocation
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14
Q

Why would an organism operate fossorial locomotion?

A
  • digging to establish safer habitat
  • secure food items
  • escape predators
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15
Q

3 forms of digging

A
  • chisel tooth digging
  • scratch digging
  • rotational thrust digging
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16
Q

Key adaptations for fossorial locomotion?

A

basically OPPOSITE TO CURSORIAL

  • retaining the clavicle
  • short broad limbs that retain 5 digits to attach to claws
  • posterior extension of the scapula
  • muscles insert far from pivot
  • enlarged processes for muscle attachment
17
Q

What is natatorial locomotion?

A

swimming

18
Q

Part time swimmers are known as being ‘(a)’ and have adaptations similar to those in fossorial locomotion. Describe these.

A

a) paraxial

  • large in lever arms
  • huge areas for muscle attachment
  • proximal limb shortening
  • manus elongation
19
Q

Full time swimmers are known as being ‘(a)’ and have what kind of adaptations? (b)

A

a) axial

b) - greatly reduced proximal bones
- hyperphalangy
- fin like limbs
- distal bones part of paddle

20
Q

What kind of undulations to axial swimmers use?

A
  • dorso ventral NOT LATERAL
21
Q

What structure in axial swimmers is supported by connective tissue?
What kind of shape are axial swimmers?

A
  • long robust tail

- fusiform

22
Q

What is scansorial locomotion?

A
  • adapted for climbing
23
Q

How do scansorial animals add friction and overcome the steeper shearing force pushing them down?

A
  • bind with surface eg. sucker footed bat
  • interlock with surface eg. koala
  • prehensile tail
  • globular digits
24
Q

How do scansorial animals avoid toppling?

A
  • grasping extremities to exert on opposing torque
  • hang under surface
  • lower your centre of gravity
  • become smaller
  • use a tail
25
Q

What are the features of a bipedal jump?

A
  • long hind limbs
  • long tail for balancing and steering
  • modified ankles to shock absorb and lengthen foot
26
Q

a) Key adaptations for gliding

b) Cons of glidings, how is this overcome?

A

a) patagium membrane
dorsoventrally flattened tails

b) vulnerable to bird predators so often nocturnal creatures

27
Q

3 forces important in flying

cons of flying?

A
  • create lift
  • reduce drag
  • generate forward thrust

b) very energy intensive

28
Q

What do bat wings look like?

A
  • long metacarpels and phalanges

- olecranon fused to the radius

29
Q

how is mass and inertia reduced in flying mammals?

A
  • slender non pneumatic bones
  • finger bones deal with tensional forces
  • stay systems at leading edge mean that no muscles are needed to resist bending
30
Q

What is the bone structure of a flying mammal?

A
  • clavicle pivots on sternum, whilst scapula moves for wing movement
  • wing flexion and extension
  • body rigid and compact
31
Q

A wing downstroke is powered by the (a) muscle and always brings about (b). Whereas, the upstroke is powered by the (c) and only causes thrust when travelling at (d) speed.

A

a) pectoralis
b) thrust
c) deltoideus
d) high

32
Q

a) What is the wing loading ratio?
a HIGH one means…

b) What is the aspect ratio?
a HIGH one means…
a LOW one means…

A

a) body mass/ wing area
- low manoeuvrability, high speed

b) wing span/ wing area
- short, broad wing high manoeuvrability
- long, narrow wing

33
Q

What wings allow hovering motion?

A

elliptical

34
Q

What are characteristics of fast, high speed wings?

A
  • high wing load
  • high aspect ratio
  • low camper to reduce drag

DAN NUSSEY (3 decks)

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