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The Developing Animal > Clairs revision small animal AnP > Flashcards

Clairs revision small animal AnP Flashcards

1
Q

What happens to the Embryo at 4Weeks?

A

Forming vertebrae + limb buds

20mm in length

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2
Q

What happens to the Embryo at 5weeks??

A

Eye lids, internal ears and teeth start to form

35mm in length

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3
Q

What happens to the foetus at 6Weeks?

A

Digits and external genitalia are well developed

60mm in length

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4
Q

What happens to the Foetus at 7weeks?

A

Ossification of vertebrae + some long bones

100mm in length

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5
Q

What happens to the Foetus at 8weeks?

A

Has hair and pads

150mm in length

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6
Q

What happens to foetus at 9 weeks?

A

Foetus is usually delivered

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7
Q

Function of the ovary?

A

Produce eggs ready for fertilisation

Secrete Oestrogen and Progesterone

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8
Q

Function of the Uterus?

A

Provides an environment for development of Embryo

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9
Q

Function of Testes?

A

Produce sperm and Testosterone

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10
Q

Function of the Scrotum?

A

Holds the testes out side the body

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11
Q

Function of the Cremaster Muscle?

A

Allows raising + lowering of the testiest

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12
Q

Function of the Sertoli Cells?

A

Provide oestrogen’s + nutritive fluid for sperm

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13
Q

Function of the Epididymus?

A

Transfer sperm 2 vas deference

Also acts as a storage organ

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14
Q

Function of the Bulbo-urethral gland?

A

Contributes to seminal fluid

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15
Q

Function of the Prepuce?

A

Lined with mucos epithelium protects penis

Pushed back during mating protects distal end of penis

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16
Q

Name 2 accessory glands found in the male cats genital system?

A

Bulbo-urethral gland

Prostate

17
Q

How many pairs of teats dose a female guinea pig have?

A

Single pair of teats

18
Q

Describe the behaviour of the bitch during Pro-oestrus?

A
  • increasingly attractive to males
  • more active, restless urinate more
  • will not stand to be mated
19
Q

Behaviour of bitch during Metoestrus?

A

Nesting behaviour begins

She will not stand to be mated

Term of pregnancy may become more dependant or less

20
Q

Bitches behaviour during Anoestrus?

A

No sexual activity

Not attractive to males

21
Q

Behaviour of bitch during Oestrus?

A

Flirting bitch will allow to be mated

22
Q

What dose the hormone Gonadotrophic releasing do?

A

Released from the hypothalamus in response to increasing day length

23
Q

What dose the hormone Oxytocin do?

A

Contraction of uterus

Milk let down

24
Q

What dose the Lutenising hormone do?

A

This hormone causes ovulation to occur

25
Q

Function of Testosterone?

A

Production of sperm

Secondary sexual characteristics

26
Q

Function of Relaxin?

A

Produced by the corpus luteum in stages of pregnancy

27
Q

Describe the development of the Zygote from fertilisation to the formulation of the Morula?

A
  • Following fertilisation. The zygote will travel down fallopian tube dividing cells as it goes (via mitosis)

Eventually they form a solid ball of cells called morula

28
Q

What is the Ovum called once it has been fertilised??

A

Zygote

29
Q

Name two germ cell layers?

A

Ectoderm

Mesoderm

30
Q

When dose implantation of the embryo take place in the bitch?

A

14-20 after Ovulation

31
Q

What is the correct name for the water bag?

A

Chorio-allantosis

32
Q

What is the correct name for the slime bag?

A

Allanto-amnion

33
Q

What are the narrow bands between the placenta and the extra embryonic membranes called?

A

Marginal Haematomas

34
Q

What colour is the vaginal discharge of a queen at parturition?

A

Brown

35
Q

At what stage of embryonic development do limb buds appear??

A

Limb buds appear at 4 weeks of age.

36
Q

Describe describe the process of Spermatogenesis??

A
  • Testies are made of seminiferous tubules lined with spermatogenic + sertoli cells
  • Spermatogenic cells are stimulated by testosterone to produce sperm thro process of mitosis + meiosis
  • Stertoli cells produce nutritive fluid which nourishes sperm
  • Leydig are stimulated by LH to produce testosterone
37
Q

Whats the difference between a spontaneous ovulation and induced ovulation?

A

Induced ovulation - only ovulate if married (cats,rabbits,ferrets)

Spontaneous ovulation - dont need mated to ovulate (dogs,rats, guinea pigs)

38
Q

What effect the administration of progestogen has on the oestrus cycle of a bitch if it is given during pro-oestrus?

A

Can cause cystic endometrial hyper plasma and pyometra

39
Q

What happens to the embryo at 3Weeks?

A

Allantosis formed

Embryo approx 5mm in length

The Developing Animal (4 decks)

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