HormonalHousewife That's great to hear about your ds doing so well.
LadyMargolotta if you look at the apraxia-kids website there is a chart with the difference between apraxia and phonological disorder (and also dysarthria). I've tried copying the link but I don't think I've been successful!
www.apraxia-kids.org/site/apps/nl/content3.asp?c=chKMI0PIIsE&b=788447&ct=464135
Verbal apraxia is a neurological motor speech impairment that involves a breakdown in the transmission of messages from the brain to the muscles in the jaw, cheeks, lips, tongue and palate that facilitate speech.
I think they say it is a bit like us trying to watch tv without it properly tuned in but having to make sense of it. The way I sometimes view it is my DS's library of words in his head is stored in a different way from the norm so his recall is done in a "chaotic" manner when he wants to say something, while someone without speech apraxia has a well organised, sructured storage of words and so can find the words automatically.
This definition may also help you:
Verbal apraxia (VA) is a motor speech disorder that interferes with an individuals? ability to correctly pronounce sounds, syllables, and words. It is a neurologically-based motor planning disorder of unknown cause. It affects the programming of the articulators and rapid sequences of muscle movements for speech sounds. Verbal apraxia may occur as part of many neurological conditions or may occur in isolation.
I think motor apraxia is when there is a problem with the muscles when trying to speak.
The fact your ds wants to sing is wonderful. It is meant to be good for speech apraxia.
Being able to pronounce "t" is great. When my ds was doing his speech therapy he made the best progress when we just focused on small steps. So for instance one week we would just do "sh" words. The fact your ds is progressing and you are noticing a difference is very encouraging.
Tell the teacher and your relatives how to respond to your ds when they don't understand him. For instance, I would usually tell them to say "could you say that a bit louder please because my hearing isnt the best/ there is too much noise in the background/etc so your ds doesn't feel self conscious when he speaks.
In the apraxia-kids website there is a link to "My child has apraxia - letter to the teacher" which you may like.
To diagnose my ds he had a verbal test with the head speech therapist in our area when he was about 7 years old. He hasn't had any neurological tests. It does sound a bit scary, however, if my ds was offered them I would accept. I think it might help to pinpoint things better because as I said in my earlier post I think there is a bit of a blur with speech disorders like apraxia.
The initial stages of speech apraxia can be daunting but things will workout okay. Just remember when you go through these tests how wonderful your ds is. I wish you and your ds all the very best.